This page has only limited features, please log in for full access.

Unclaimed
Seunghun Hyun
Department of Environmental Science and Ecological Engineering, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Korea

Honors and Awards

The user has no records in this section


Career Timeline

The user has no records in this section.


Short Biography

The user biography is not available.
Following
Followers
Co Authors
The list of users this user is following is empty.
Following: 0 users

Feed

Journal article
Published: 10 May 2021 in Applied Sciences
Reads 0
Downloads 0

For site-specific soil ecological risk assessments (SERAs), an integrated chemical, ecotoxicological, and ecological analysis needs to be performed. The SERA guidelines of international institutions and countries recommend that a SERA be initiated at the screening level to save time and social economic cost; however, they provide no unified test species for this screening level. This study performed SERAs for field soils and confirmed the importance of selecting bioassay test species that reflect the ecotoxicity of field soils at the screening level. To confirm test species that reflect the ecological risk of field soils, correlation analysis was performed on the results of each bioassay with the integrated ecotoxicological risk index (EtoxRI). Our results showed that soil algae, nematodes, and plants were the most representative species in soil assays, with high correlation coefficients with EtoxRI. The results imply the importance of selecting test species that represent ecological risk for the screening level of SERAs. Based on these findings, when using SERAs, species sensitivity, ecological relevance, and economic aspects should be considered when selecting the bioassay test species.

ACS Style

Dokyung Kim; Tae-Yang Lee; Lia Kim; Rongxue Cui; Jin Kwak; Haemi Kim; Sun-Hwa Nam; Minjin Kim; Wonjae Hwang; Ji-In Kim; Seunghun Hyun; Youn-Joo An. Selecting Bioassay Test Species at the Screening Level of Soil Ecological Risk Assessments. Applied Sciences 2021, 11, 4314 .

AMA Style

Dokyung Kim, Tae-Yang Lee, Lia Kim, Rongxue Cui, Jin Kwak, Haemi Kim, Sun-Hwa Nam, Minjin Kim, Wonjae Hwang, Ji-In Kim, Seunghun Hyun, Youn-Joo An. Selecting Bioassay Test Species at the Screening Level of Soil Ecological Risk Assessments. Applied Sciences. 2021; 11 (9):4314.

Chicago/Turabian Style

Dokyung Kim; Tae-Yang Lee; Lia Kim; Rongxue Cui; Jin Kwak; Haemi Kim; Sun-Hwa Nam; Minjin Kim; Wonjae Hwang; Ji-In Kim; Seunghun Hyun; Youn-Joo An. 2021. "Selecting Bioassay Test Species at the Screening Level of Soil Ecological Risk Assessments." Applied Sciences 11, no. 9: 4314.

Journal article
Published: 22 January 2021 in Chemosphere
Reads 0
Downloads 0

There is a lack of information on how aging affects the sorption of ionizable organic compounds on biochar-amended soils. To that end, this study investigates the sorption of two hydrophobic solutes (anthracene (ANT) and 9-anthroic acid (9-ANCA)) onto biochar-amended (5%, w/w) soils as a function of aging period (0, 6, and 12 months), electrolyte (5 mM CaCl2 and 10 mM KCl), and aqueous pH. The isotherm plot of both solutes was fairly linear (r2 > 0.998) and the linear sorption coefficient (Kd, L kg−1) was obtained from this. In CaCl2 solution at pH 5, the log Kd of ANT tended to decrease (from 3.90 to 3.72) with an increasing aging period, which was attributed to clogged pore surface, whereas the differences in 9-ANCA sorption (from 2.56 to 2.51) were not significant (α = 0.05). The increased ANT sorption at acidic pH (8). The spectroscopic data and isoelectric point measurement results indicated that the number of oxygen-containing functional groups and the content of elemental oxygen were both higher in aged samples, resulting in a more polar (negatively charged) surface. The formation of surface polar groups and the associated deformation altered the adsorbent nature of the tested biochar, thereby fortifying the hydrophilic retention propensity for ionizable organic solutes.

ACS Style

Juhee Kim; Chanyang Kim; Minseok Park; Wonjae Hwang; Minhee Kim; Seunghun Hyun. Sorption of anthracene (C14H10) and 9-anthroic acid (C15H10O2) onto biochar-amended soils as affected by field aging treatments. Chemosphere 2021, 273, 129670 .

AMA Style

Juhee Kim, Chanyang Kim, Minseok Park, Wonjae Hwang, Minhee Kim, Seunghun Hyun. Sorption of anthracene (C14H10) and 9-anthroic acid (C15H10O2) onto biochar-amended soils as affected by field aging treatments. Chemosphere. 2021; 273 ():129670.

Chicago/Turabian Style

Juhee Kim; Chanyang Kim; Minseok Park; Wonjae Hwang; Minhee Kim; Seunghun Hyun. 2021. "Sorption of anthracene (C14H10) and 9-anthroic acid (C15H10O2) onto biochar-amended soils as affected by field aging treatments." Chemosphere 273, no. : 129670.

Journal article
Published: 04 January 2021 in Pedosphere
Reads 0
Downloads 0

Understanding the greenhouse gas (GHG) emission from rice paddy fields is essential to come up with appropriate countermeasure in response to global warming. However, GHG emissions from paddy fields in South Korea are not well characterized. The objectives of this study were to estimate the carbon dioxide (CO2) and methane (CH4) emissions from rice paddy fields in South Korea, under the Representative Concentration Pathway 8.5 (RCP-8.5) climate change scenario using the DNDC (i.e., DeNitrification-DeComposition) model at 1-km2 resolution. The performance of the model was verified with field data collected using a closed chamber, which supports the application of the model to South Korea. Both the model predictions and field measurements showed that most (> 95%) GHG emissions occur in the cropping period, between April and October. As a baseline (assuming no climate change), the national sums of the CO2 and CH4 emissions for the 2020s and 2090s were estimated to be 5.8 × 106 and 6.0 × 106 t CO2-equivalents (CO2-eq) year–1 for CO2 and 6.4 × 106 and 6.6 × 106 t CO2-eq year–1 for CH4, respectively, indicating no significant changes over 80 years. Under RCP-8.5, in the 2090s, CH4 emissions were predicted to increase by 10.7 × 106 and 14.9 × 106 t CO2-eq year–1, for a 10- or 30-cm tillage depth, respectively. However, the CO2 emissions gradually decreased with rising temperatures, due to reduced root respiration. Deep tillage increased the emissions of both GHGs, with a more pronounced effect for CH4 than CO2. Intermittent drainage in the middle of the cropping season can attenuate the CH4 emissions from paddy fields. The findings of this work will aid in developing nationwide policies on agricultural land management in the face of climate change.

ACS Style

Wonjae Hwang; Chanyang Kim; Kijong Cho; Seunghun Hyun. Characteristics of greenhouse gas emissions from rice paddy fields in South Korea under climate change scenario RCP-8.5 using the DNDC model. Pedosphere 2021, 31, 332 -341.

AMA Style

Wonjae Hwang, Chanyang Kim, Kijong Cho, Seunghun Hyun. Characteristics of greenhouse gas emissions from rice paddy fields in South Korea under climate change scenario RCP-8.5 using the DNDC model. Pedosphere. 2021; 31 (2):332-341.

Chicago/Turabian Style

Wonjae Hwang; Chanyang Kim; Kijong Cho; Seunghun Hyun. 2021. "Characteristics of greenhouse gas emissions from rice paddy fields in South Korea under climate change scenario RCP-8.5 using the DNDC model." Pedosphere 31, no. 2: 332-341.

Journal article
Published: 27 September 2020 in Polymers
Reads 0
Downloads 0

A surface-engineered nano-support for enzyme laccase-immobilization was designed by grafting the surface of halloysite nanotubes (HNTs) with Fe3O4 nanoparticles and chitosan. Herein, HNTs were magnetized (HNTs-M) by a cost-effective reduction-precipitation method. The synthesized HNTs-M were grafted with 0.25%, 0.5%, 1%, and 2% chitosan (HNTs-M-chitosan), respectively. Synthesized HNTs-M-chitosan (0.25%), HNTs-M-chitosan (0.5%), HNTs-M-chitosan (1%) and HNTs-M-chitosan (2%) were linked with glutaraldehyde (GTA) for laccase immobilization. Among these formulations, HNTs-M-chitosan (1%) exhibited the highest laccase immobilization with 95.13% activity recovery and 100.12 mg/g of laccase loading. The optimized material was characterized thoroughly by scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HR-TEM), X-ray powder diffraction (XRD), thermal gravimetric analysis (TGA), and vibrating sample magnetometer (VSM) analysis. The immobilized laccase (HNTs-M-chitosan (1%)-GTA-Laccase) exhibited higher pH, temperature, and storage stabilities. The HNTs-M-chitosan (1%)-GTA-Laccase possesses excellent reusability capabilities. At the end of 10 cycles of the reusability experiment, HNTs-M-chitosan (1%)-GTA-Laccase retained 59.88% of its initial activity. The immobilized laccase was utilized for redox-mediated degradation of sulfamethoxazole (SMX), resulting in 41%, 59%, and 62% degradation of SMX in the presence of 2,2′-Azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) diammonium salt (ABTS), guaiacol (GUA), and syringaldehyde (SA), respectively. Repeated SMX degradation (57.10% after the sixth cycle) confirmed the potential of HNTs-M-chitosan (1%)-GTA-Laccase for environmental pollutant degradation. Thus, we successfully designed chitosan-based, rapidly separable super-magnetic nanotubes for efficacious enhancement of laccase biocatalysis, which can be applied as nano-supports for other enzymes.

ACS Style

Avinash A. Kadam; Surendra K. Shinde; Gajanan S. Ghodake; Ganesh D. Saratale; Rijuta G. Saratale; Bharat Sharma; Seunghun Hyun; Jung-Suk Sung. Chitosan-Grafted Halloysite Nanotubes-Fe3O4 Composite for Laccase-Immobilization and Sulfamethoxazole-Degradation. Polymers 2020, 12, 2221 .

AMA Style

Avinash A. Kadam, Surendra K. Shinde, Gajanan S. Ghodake, Ganesh D. Saratale, Rijuta G. Saratale, Bharat Sharma, Seunghun Hyun, Jung-Suk Sung. Chitosan-Grafted Halloysite Nanotubes-Fe3O4 Composite for Laccase-Immobilization and Sulfamethoxazole-Degradation. Polymers. 2020; 12 (10):2221.

Chicago/Turabian Style

Avinash A. Kadam; Surendra K. Shinde; Gajanan S. Ghodake; Ganesh D. Saratale; Rijuta G. Saratale; Bharat Sharma; Seunghun Hyun; Jung-Suk Sung. 2020. "Chitosan-Grafted Halloysite Nanotubes-Fe3O4 Composite for Laccase-Immobilization and Sulfamethoxazole-Degradation." Polymers 12, no. 10: 2221.

Journal article
Published: 02 September 2020 in International Journal of Environmental Research and Public Health
Reads 0
Downloads 0

Ammonia (NH3) is an important precursor for particulate secondary aerosol formation. This study was conducted to evaluate the applicability of a passive sampler (PAS) for estimating the NH3 emission from chemical fertilizer application (85 kg-N·ha−1) at field scale and to compare the results with a chamber system for the calculation of NH3 emission flux at lab scale. The application of chemical fertilizer increased the ambient NH3 concentration from 7.11 to 16.87 μg·m−3. Also, the ambient NH3 concentration measured by the PAS was found to be highly influenced by not only the chemical fertilizer application but also the weather (temperature and rainfall). Wind rose diagram data can be useful for understanding the distribution of ambient NH3 concentration. In the case of a chamber with few environmental variables, NH3 was emitted very quickly in the early stages and gradually decreased, whereas it was delayed at intervals of about one week at the site. It was found that daily temperature range, atmospheric disturbance by wind and rainfall, changes in soil moisture, and the presence of a flooded water table were the main influencing factors. The PAS data and the chamber system data were observed to have significant differences in spatial-temporal scale. In order to reduce the gap, it seems to be necessary to further develop a chamber system, in order to improve the precision of field analysis and to strengthen the connection between experimental results.

ACS Style

Min-Suk Kim; Namin Koo; Seunghun Hyun; Jeong-Gyu Kim. Comparison of Ammonia Emission Estimation between Passive Sampler and Chamber System in Paddy Soil after Fertilizer Application. International Journal of Environmental Research and Public Health 2020, 17, 6387 .

AMA Style

Min-Suk Kim, Namin Koo, Seunghun Hyun, Jeong-Gyu Kim. Comparison of Ammonia Emission Estimation between Passive Sampler and Chamber System in Paddy Soil after Fertilizer Application. International Journal of Environmental Research and Public Health. 2020; 17 (17):6387.

Chicago/Turabian Style

Min-Suk Kim; Namin Koo; Seunghun Hyun; Jeong-Gyu Kim. 2020. "Comparison of Ammonia Emission Estimation between Passive Sampler and Chamber System in Paddy Soil after Fertilizer Application." International Journal of Environmental Research and Public Health 17, no. 17: 6387.

Journal article
Published: 21 July 2020 in International Journal of Environmental Research and Public Health
Reads 0
Downloads 0

Paddy mesocosms comprising of rice (Oryza sativa), snail (Pomacea canaliculata), and worm (Tubifex tubifex) were used to assess the damage caused by two acids (HNO3 and H2SO4) at predicted no-effect concentration (PNEC) and hazardous concentration for 50% of species (HC50) levels. In the fourth week, the fresh weight and shoot height of O. sativa at H2SO4-HC50 were reduced by 83.2% and 30.3%, respectively. Wilted leaves (%) at HC50 were approximately twice that at PNEC. No P. canaliculata and T. tubifex were recovered at HC50. At H2SO4-PNEC, the length and weight of P. canaliculata were reduced by 7.4% and 25.9%, respectively, whereas fewer adult (46.5%) and juvenile (84%) T. tubifex were recovered. In the 20th week, rice growth and productivity were correlated with initial pH (pHi) and nitrogen levels. Poor correlation with chlorophyll at the active tillering stage suggests the disturbance of nutrient uptake by roots. Partial least squares path modeling (PLS-PM) results further supported that the pHi directly affects grain yield and quality, as well as plant growth. The indirect effect via intervening fourth-week-variables was also substantial. Therefore, it is important to measure initial pH upon acid spill to estimate the risk to the paddy ecosystem. Information on the change in soil properties associated with acidity will also aid in predicting the yield and quality of grain to be harvested.

ACS Style

Minseok Park; Wonjae Hwang; Jino Son; June Wee; Kijong Cho; Seunghun Hyun. Effect of HNO3 and H2SO4 on the Paddy Ecosystem:A Mesocosm Study with Exposure at PNEC and HC50 Levels. International Journal of Environmental Research and Public Health 2020, 17, 5244 .

AMA Style

Minseok Park, Wonjae Hwang, Jino Son, June Wee, Kijong Cho, Seunghun Hyun. Effect of HNO3 and H2SO4 on the Paddy Ecosystem:A Mesocosm Study with Exposure at PNEC and HC50 Levels. International Journal of Environmental Research and Public Health. 2020; 17 (14):5244.

Chicago/Turabian Style

Minseok Park; Wonjae Hwang; Jino Son; June Wee; Kijong Cho; Seunghun Hyun. 2020. "Effect of HNO3 and H2SO4 on the Paddy Ecosystem:A Mesocosm Study with Exposure at PNEC and HC50 Levels." International Journal of Environmental Research and Public Health 17, no. 14: 5244.

Journal article
Published: 28 March 2020 in Chemosphere
Reads 0
Downloads 0

La/Mg/Si-activated carbon derived from palm shell has been a suitable material for removal of aluminum and fluoride from aqueous solution. In the study, the mechanism of simultaneous removal of aluminum and fluoride by La/Mg/Si-activated carbon (La/Mg/Si-AC) was investigated to understand its high efficiency. It was found that the removal of aluminum and fluoride by La/Mg/Si-AC was favored at lower pH compared to the point of zero charge of La/Mg/Si-AC and high temperature. Adsorption capacity of Al(OH)4- was about 10 times higher than that of F- due to the strong binding affinity of Al(OH)4- on protonated surface and competition between F- and OH- toward charged adsorption site. Kinetics results showed that the aluminum and fluoride adsorption were explained using the pseudo-second-order kinetic model and intra-particle diffusion model. Adsorption process of Al(OH)4- and F- was driven by the potential rate-limiting step involved in mass transport process occurred on the boundary diffusion layer of porous adsorbent surface. Electrostatic interaction between protonated surface of La/Mg/Si-AC and negatively charged ions (i.e., Al(OH)4- and F-) as well as ion-exchange between hydroxide and ionic metal species were important mechanisms in the process of aluminum and fluoride adsorption. Driving forces for adsorption of individual Al(OH)4- and F- were not entirely different. Identifying the dominant mechanism will be helpful in understanding the adsorption process and developing new adsorbent.

ACS Style

Minhee Kim; Choe Earn Choong; Seunghun Hyun; Chang Min Park; Gooyong Lee. Mechanism of simultaneous removal of aluminum and fluoride from aqueous solution by La/Mg/Si-activated carbon. Chemosphere 2020, 253, 126580 .

AMA Style

Minhee Kim, Choe Earn Choong, Seunghun Hyun, Chang Min Park, Gooyong Lee. Mechanism of simultaneous removal of aluminum and fluoride from aqueous solution by La/Mg/Si-activated carbon. Chemosphere. 2020; 253 ():126580.

Chicago/Turabian Style

Minhee Kim; Choe Earn Choong; Seunghun Hyun; Chang Min Park; Gooyong Lee. 2020. "Mechanism of simultaneous removal of aluminum and fluoride from aqueous solution by La/Mg/Si-activated carbon." Chemosphere 253, no. : 126580.

Journal article
Published: 04 February 2020 in Chemosphere
Reads 0
Downloads 0

Leaching of toxic metallic elements (Cu, Zn, As, Cd, and Pb) from two solid mine wastes was characterized under different drying treatments. During 14 batch decant-refill leaching steps, samples were intermittently dried four times in 40 °C oven or −20 °C freezer. For all leachates, the pH, pE, Fe2+/Fe3+, and SO42− were analyzed. The parameters of the two-site model (kfast, kslow, and ffast) and labile fractions (F1 + F2) were determined. High levels of toxic metallic elements were determined in waste samples; however, their leaching was limited, as evidenced by the magnitudes of F1 + F2, ffast, and kslow. Leachate solutions were acidic, at pH 3–4, and oxic, at 150 mV < Eh 300 < mV, thus having negligible Fe2+. Leachate concentrations of toxic metallic elements increased (4–58%) after drying at 40 °C and were strongly correlated (r2 = 0.780) with those of sulfate in liquid phase. The mass of element elution was in the order of 40 °C drying > −20 °C drying ≥ continuous wetting. Results indicate that the element leachability is increased through drying events and the leachate concentration is associated with the dissolution reaction of sulfur-bearing minerals. Frequent occurrence of prolonged droughts along with high temperatures over the mine waste disposal site, can enhance the leaching potential of toxic metallic elements.

ACS Style

Hyunwoo Bang; Juhee Kim; Kyungmin Kim; Seunghun Hyun. Effect of drying treatment on the leachability of metallic elements from weathered solid mine wastes. Chemosphere 2020, 248, 126111 .

AMA Style

Hyunwoo Bang, Juhee Kim, Kyungmin Kim, Seunghun Hyun. Effect of drying treatment on the leachability of metallic elements from weathered solid mine wastes. Chemosphere. 2020; 248 ():126111.

Chicago/Turabian Style

Hyunwoo Bang; Juhee Kim; Kyungmin Kim; Seunghun Hyun. 2020. "Effect of drying treatment on the leachability of metallic elements from weathered solid mine wastes." Chemosphere 248, no. : 126111.

Journal article
Published: 04 November 2019 in Sustainability
Reads 0
Downloads 0

In this study, we applied the Denitrification and Decomposition model to predict the greenhouse gas (GHGs; CO2 and N2O) emissions and cabbage yields from 8072 cabbage fields in Korea in the 2020s and 2090s. Model outputs were evaluated as a function of tillage depth (T1, T2, and T3 for 10, 20, and 30 cm) and fertilizer level (F1, F2, and F3 for 100, 200, and 400 kg N ha−1) under the Representative Concentration Pathways 8.5 climate change scenario. For both time periods, CO2 emissions increased with tillage depth, and N2O emissions were predominantly influenced by the level of applied N-fertilizers. Both cabbage yields and GHGs fluxes were highest when the T3F3 farming practice was applied. Under current conventional farming practices (T1F3), cabbage yield was projected at 64.5 t ha−1 in the 2020s, which was close in magnitude to the predicted cabbage demand. In the 2090s, the predicted cabbage supply by the same practice far exceeded the projected demand at 28.9 t ha−1. Cabbage supply and demand were balanced and GHGs emissions reduced by 19.6% in the 2090s when 94% of the total cabbage farms adopted low carbon-farming practices (e.g., reducing fertilizer level). Our results demonstrate the large potential for Korean cabbage farms to significantly contribute towards the mitigation of GHGs emissions through the adoption of low-carbon farming practices. However, in order to incentivize the shift towards sustainable farming, we advise that lower yield and potential economic losses in farmlands from adopting low-carbon practices should be appropriately compensated by institutional policy.

ACS Style

Wonjae Hwang; Minseok Park; Kijong Cho; Jeong-Gyu Kim; Seunghun Hyun. Mitigation of CO2 and N2O Emission from Cabbage Fields in Korea by Optimizing Tillage Depth and N-Fertilizer Level: DNDC Model Simulation under RCP 8.5 Scenario. Sustainability 2019, 11, 6158 .

AMA Style

Wonjae Hwang, Minseok Park, Kijong Cho, Jeong-Gyu Kim, Seunghun Hyun. Mitigation of CO2 and N2O Emission from Cabbage Fields in Korea by Optimizing Tillage Depth and N-Fertilizer Level: DNDC Model Simulation under RCP 8.5 Scenario. Sustainability. 2019; 11 (21):6158.

Chicago/Turabian Style

Wonjae Hwang; Minseok Park; Kijong Cho; Jeong-Gyu Kim; Seunghun Hyun. 2019. "Mitigation of CO2 and N2O Emission from Cabbage Fields in Korea by Optimizing Tillage Depth and N-Fertilizer Level: DNDC Model Simulation under RCP 8.5 Scenario." Sustainability 11, no. 21: 6158.

Journal article
Published: 01 May 2019 in Ecotoxicology and Environmental Safety
Reads 0
Downloads 0

The accumulation of metalloid elements during transfer from contaminated soil to higher trophic levels may potentially result in the exposure of parasitic arthropods to toxic concentrations of these elements. This study examined the transfer of arsenate (As(V)) to aphids (Myzus persicae) from pepper plants cultivated in As(V) contaminated soils of two concentrations (2 and 6 mg As(V)/kg dry soil), and the subsequent biological effects on the aphid parasitoid, Aphidius colemani. Results showed that considerable quantities of As(V) were transferred to the plant in a concentration-dependent manner and were partitioned in the plant parts in the order of roots > stems > leaves. The accumulation of As(V) in the aphids increased with the concentrations in the plants; however, the transfer coefficient of As(V) from leaf to aphid was relatively similar and constant (0.07-0.08) at both soil As(V) concentration levels. Increased levels of As(V) significantly affected fecundity and honeydew production in aphids, but survival and developmental time were unaffected. Fecundity (mummification rate) of the parasitoid was not impaired by host As(V) contamination; however, vitality (eclosion rate) was significantly affected. Results are discussed in relation to possible ecological risks posed by the transfer of soil As(V) via the plant-arthropod system to parasitoid arthropods in agroecosystems.

ACS Style

Myeongseob Kim; Minyoung Lee; Yongeun Kim; Yun-Sik Lee; Jino Son; Seunghun Hyun; Kijong Cho. Transfer and biological effects of arsenate from soil through a plant-aphid system to the parasitoid wasp, Aphidius colemani. Ecotoxicology and Environmental Safety 2019, 173, 305 -313.

AMA Style

Myeongseob Kim, Minyoung Lee, Yongeun Kim, Yun-Sik Lee, Jino Son, Seunghun Hyun, Kijong Cho. Transfer and biological effects of arsenate from soil through a plant-aphid system to the parasitoid wasp, Aphidius colemani. Ecotoxicology and Environmental Safety. 2019; 173 ():305-313.

Chicago/Turabian Style

Myeongseob Kim; Minyoung Lee; Yongeun Kim; Yun-Sik Lee; Jino Son; Seunghun Hyun; Kijong Cho. 2019. "Transfer and biological effects of arsenate from soil through a plant-aphid system to the parasitoid wasp, Aphidius colemani." Ecotoxicology and Environmental Safety 173, no. : 305-313.

Case report
Published: 22 November 2018 in Sustainability
Reads 0
Downloads 0

A common-pool resource (CPR) is a type of good consisting of a natural or human-made resource system. Jeju common ranches are historical CPRs located in Jeju Province where mid-mountainous grassland has been shared for livestock farming by the members of adjacent villages since the 10th century. Because of the recent globalization movement, the number of ranches has decreased from 126 in the 1940s to only 53 in 2015; while the majority of the ranches did not survive the transformation, others have remained active by adopting various solutions. In this study, we analyzed the administrative characteristics of the CPRs to explain their current status (i.e., extinction or continuance as a common property) using logistic regression analysis. From this analysis, four statistically meaningful variables were extracted using a forward stepwise selection method; these include the type of ranch management, ratio of land area to population, number of internal committees in the village, and number of local government grants. These variables correlate well with previously recognized ‘community resilience dimensions’ and can be used to explain the fate of the Jeju common ranches during the study period. This study elucidates what community dimensions should be fortified to promote the resilience of Jeju common ranches in order to effectively cope with the on-going effects of globalization.

ACS Style

Kyungmin Kim; Juhee Kim; Kijong Cho; Jeong-Gyu Kim; Seunghun Hyun. Analysis of the Resilience of Common-Pool Resources during Globalization: The Case of Jeju Common Ranches in Korea. Sustainability 2018, 10, 4346 .

AMA Style

Kyungmin Kim, Juhee Kim, Kijong Cho, Jeong-Gyu Kim, Seunghun Hyun. Analysis of the Resilience of Common-Pool Resources during Globalization: The Case of Jeju Common Ranches in Korea. Sustainability. 2018; 10 (12):4346.

Chicago/Turabian Style

Kyungmin Kim; Juhee Kim; Kijong Cho; Jeong-Gyu Kim; Seunghun Hyun. 2018. "Analysis of the Resilience of Common-Pool Resources during Globalization: The Case of Jeju Common Ranches in Korea." Sustainability 10, no. 12: 4346.

Journal article
Published: 01 February 2018 in Science of The Total Environment
Reads 0
Downloads 0

The sorption of naphthalene (NAP) and 1-naphthoic acid (1-NAPA) onto giant Miscanthus-derived biochar was investigated in methanol volume fractions (f) of 0-0.6 as a function of ionic composition (5mM CaCl and 10mM KCl) and liquid pH (2 and 7). The sorption onto biochar was nonlinear with 0.42≤N≤0.95; thus, a concentration-specific sorption constant (K) was compared. The K log linearly decreased with increasing f, except for 1-NAPA from a CaCl mixture at pH7. Isotherm data was fitted with a cosolvency sorption model through which the slope (ασ) of the inverse log linear K-f plot and empirical constant (α) were obtained. NAP sorption was well described by the cosolvency model with the α value being 0.41-0.53, indicating a methanol-biochar interaction favoring more sorption than the cosolvency based prediction. In particular, the slope (ασ) of 1-NAPA was lower than that of NAP, indicating less reduction of 1-NAPA sorption (i.e., lower α value) by methanol. In comparison with other sorbents, the α value was approximately intermediate between a humic substance and kaolinite clay. An analysis of FT-IR spectra suggested the transformation of O-containing functional groups by methanol, which will subsequently boost the π-π interaction between an organic solute and biochar. Moreover, Ca-induced sorption between anionic 1-NAPA and a negatively charged biochar surface was also fortified in the methanol mixture. The results revealed unexplored cosolvent effects on organic solute sorption onto biochar and identified the hydrophobic and hydrophilic sorption moieties of biochar as affected by the cosolvent.

ACS Style

Juhee Kim; Seunghun Hyun. Sorption of ionic and nonionic organic solutes onto giant Miscanthus-derived biochar from methanol-water mixtures. Science of The Total Environment 2018, 615, 805 -813.

AMA Style

Juhee Kim, Seunghun Hyun. Sorption of ionic and nonionic organic solutes onto giant Miscanthus-derived biochar from methanol-water mixtures. Science of The Total Environment. 2018; 615 ():805-813.

Chicago/Turabian Style

Juhee Kim; Seunghun Hyun. 2018. "Sorption of ionic and nonionic organic solutes onto giant Miscanthus-derived biochar from methanol-water mixtures." Science of The Total Environment 615, no. : 805-813.

Journal article
Published: 01 October 2017 in Journal of Hazardous Materials
Reads 0
Downloads 0
ACS Style

Juhee Kim; Seunghun Hyun. Soil attenuation of the seepage potential of metallic elements (Cu, Zn, As(V), Cd, and Pb) at abandoned mine sites: A batch equilibrium sorption and seepage column study. Journal of Hazardous Materials 2017, 339, 292 -300.

AMA Style

Juhee Kim, Seunghun Hyun. Soil attenuation of the seepage potential of metallic elements (Cu, Zn, As(V), Cd, and Pb) at abandoned mine sites: A batch equilibrium sorption and seepage column study. Journal of Hazardous Materials. 2017; 339 ():292-300.

Chicago/Turabian Style

Juhee Kim; Seunghun Hyun. 2017. "Soil attenuation of the seepage potential of metallic elements (Cu, Zn, As(V), Cd, and Pb) at abandoned mine sites: A batch equilibrium sorption and seepage column study." Journal of Hazardous Materials 339, no. : 292-300.

Protection and restoration of the environment
Published: 04 September 2017 in Environmental Science and Pollution Research
Reads 0
Downloads 0

Chemical stability of As(V) in amended mine-impacted soils was assessed according to functions of incubation period (0, 1, 2, 4, and 6 months), amendment dose (2.5 and 5%), and application timing (0 and 3rd month). Six soils contaminated with 26–209 mg kg−1 of As(V) were collected from two abandoned mine sites and were treated with two alkaline iron-rich materials (mine discharge sludge (MS) and steel-making slag (SS)). Seventeen to 23% of As(V) in soils was labile. After each designated time, As(V) stability was assessed by the labile fractions determined with sequential extraction procedures (F1–F5). Over 6 months, a reduction (26.9–70.4%) of the two labile fractions (F1 and F2) and a quantitative increase (7.4–29.9%) of As(V) in F3 were observed (r 2 = 0.956). Two recalcitrant fractions (F4 and F5) remained unchanged. Temporal change of As(V) stability in a sample was well described by the two-domain model (k fast, k slow, and Ffast). The stabilization (%) correlated well with the fast-stabilizing domain (Ffast), clay content (%), and Fe oxide content (mg kg−1), but correlated poorly with kinetic rate constants (k fast and k slow). Until the 3rd month, the 2.5%-MS amended sample resulted in lower As(V) stabilization (25–40%) compared to the 5% sample (50–60%). However, the second 2.5% MS addition on the 2.5% sample upon the lapse of the 3rd month led to a substantial reduction (up to 38%) of labile As(V) fraction in the following 4th and 6th months. As a result, an additional 15–25% of As(V) stability was obtained when splitting the amendment dose into 3-month intervals. In conclusion, the As(V) stabilization by Fe-rich amendment is time-dependent and its efficacy can be improved by optimizing the amendment dose and its timing.

ACS Style

Mijin Kim; Juhee Kim; Minhee Kim; Yong-Seong Kim; Seung Mo Nam; Deok Hyun Moon; Seunghun Hyun. Factors influencing As(V) stabilization in the mine soils amended with iron-rich materials. Environmental Science and Pollution Research 2017, 25, 26757 -26765.

AMA Style

Mijin Kim, Juhee Kim, Minhee Kim, Yong-Seong Kim, Seung Mo Nam, Deok Hyun Moon, Seunghun Hyun. Factors influencing As(V) stabilization in the mine soils amended with iron-rich materials. Environmental Science and Pollution Research. 2017; 25 (27):26757-26765.

Chicago/Turabian Style

Mijin Kim; Juhee Kim; Minhee Kim; Yong-Seong Kim; Seung Mo Nam; Deok Hyun Moon; Seunghun Hyun. 2017. "Factors influencing As(V) stabilization in the mine soils amended with iron-rich materials." Environmental Science and Pollution Research 25, no. 27: 26757-26765.

Environmental functions of biochar
Published: 28 April 2017 in Environmental Science and Pollution Research
Reads 0
Downloads 0

Agricultural soil was treated with biochar (5% w/w) produced from two pyrolysis temperatures (400 and 700 °C) of giant Miscanthus (GMC-400 and GMC-700, respectively), and the subsequent sorption of sulfathiazole (STZ) was evaluated as a function of pH (2, 5, and 7) and aging period (0, 3, and 6 months). Because sorption was nonlinear, with 0.51 < N < 0.75, the linearized sorption coefficient (K d(*)) was used for the comparison across samples. The K d(*) of GMC-400 treatment (3.96-9.96 L kg(-1)) was higher than that of GMC-700 treatment (1.27-3.38 L kg(-1)). In laps of aging period over 6 months, the sorption of GMC-400-treated soil had gradually increased to be 3.3 times higher than that of untreated soil, whereas there was no statistical difference for GMC-700 treatment. Results of FTIR and SEM analyses revealed that the number of O-containing functional groups in the GMC-400 treatment increases and the micropores of GMC-700 are deformed over time. Sorption was also pH-dependent in the order of pH 2 > pH 5 > pH 7. The sorption hysteresis (H) index for the GMC-400 treatment was higher at pH 7 (3.99) than at pH 5(2.53), and both values had increased after 6 months (4.18 and 3.17, respectively). The results of this study clearly demonstrate that the sorption of STZ on GMC-treated soils is greatly enhanced, mainly through the greater micropore surfaces, the abundance of hydrophilic functional groups over time, and π(+)-π electron donor-acceptor interaction at low pH.

ACS Style

Hyunjung Kim; Juhee Kim; Minhee Kim; Seunghun Hyun; Deok Hyun Moon. Sorption of sulfathiazole in the soil treated with giant Miscanthus-derived biochar: effect of biochar pyrolysis temperature, soil pH, and aging period. Environmental Science and Pollution Research 2017, 25, 25681 -25689.

AMA Style

Hyunjung Kim, Juhee Kim, Minhee Kim, Seunghun Hyun, Deok Hyun Moon. Sorption of sulfathiazole in the soil treated with giant Miscanthus-derived biochar: effect of biochar pyrolysis temperature, soil pH, and aging period. Environmental Science and Pollution Research. 2017; 25 (26):25681-25689.

Chicago/Turabian Style

Hyunjung Kim; Juhee Kim; Minhee Kim; Seunghun Hyun; Deok Hyun Moon. 2017. "Sorption of sulfathiazole in the soil treated with giant Miscanthus-derived biochar: effect of biochar pyrolysis temperature, soil pH, and aging period." Environmental Science and Pollution Research 25, no. 26: 25681-25689.

Research article
Published: 30 July 2016 in Environmental Science and Pollution Research
Reads 0
Downloads 0

Variation of the chemical extractability and phytoavailability of two metallic elements (e.g., As and Pb) on amendment-treated soils was investigated. Four mine-impacted agricultural soils contaminated with both As (174-491 mg kg(-1)) and Pb (116-357 mg kg(-1)) were amended with an iron-rich sludge at the rate of 5 % (w/w). After a 4-, 8-, and 16-week incubation, the extractability of metallic elements was assessed by sequential extraction procedure (SEP; F1-F5). The control without amendment was also run. In amended soils, the labile element mass (i.e., F1 + F2) promptly decreased (15-48 % of As and 5-10 % of Pb) in 4 weeks, but the decrement was continued over 16 weeks up to 70 and 28 % for As and Pb, respectively. The labile mass decrement was quantitatively corresponded with the increment of F3 (bound to amorphous metal oxides). In plant test assessed by radish (Raphanus sativus) grown on the 16-week soils, up to 57 % of As and 28 % of Pb accumulation was suppressed and 10-43 % of growth (i.e., shoot/root elongation and fresh weight) was improved. For both the control and amended soils, element uptake by plant was well correlated with their labile soil concentrations (r (2) = 0.799 and 0.499 for As and Pb, respectively). The results confirmed that the iron-rich material can effectively suppress element uptake during R. sativus seedling growth, most likely due to the chemical stabilization of metallic elements in growth medium.

ACS Style

Juhee Kim; Seunghun Hyun; Deok Hyun Moon; Jun Young Chang. Influence of an iron-rich amendment on chemical lability and plant (Raphanus sativus L.) availability of two metallic elements (As and Pb) on mine-impacted agricultural soils. Environmental Science and Pollution Research 2016, 23, 20739 -20748.

AMA Style

Juhee Kim, Seunghun Hyun, Deok Hyun Moon, Jun Young Chang. Influence of an iron-rich amendment on chemical lability and plant (Raphanus sativus L.) availability of two metallic elements (As and Pb) on mine-impacted agricultural soils. Environmental Science and Pollution Research. 2016; 23 (20):20739-20748.

Chicago/Turabian Style

Juhee Kim; Seunghun Hyun; Deok Hyun Moon; Jun Young Chang. 2016. "Influence of an iron-rich amendment on chemical lability and plant (Raphanus sativus L.) availability of two metallic elements (As and Pb) on mine-impacted agricultural soils." Environmental Science and Pollution Research 23, no. 20: 20739-20748.

Journal article
Published: 01 May 2016 in Science of The Total Environment
Reads 0
Downloads 0

The removal of Zn, As(V), and Cd during the leachate seepage process was measured in single, binary, and ternary solute systems by batch sorption and 1-D column flow experiments, followed by a sequential extraction procedure (SEP). In single-solute systems, sorption (Kd⁎) occurred in the order of As(V) > Zn ≫ Cd, and this sequence did not change in the presence of other solutes. In multi-solute systems, the sorption of Zn (~ 20%) and Cd (~ 27%) was enhanced by As(V), while Zn and Cd suppressed the sorption of each other. In all cases, As(V) sorption was not affected by the cations, indicating that As(V) is prioritized by sorption sites to a much greater degree than Zn and Cd. Element retention by column soils was strongly correlated (r2 = 0.77) with Kd⁎. Across column segments, mass retention was in the order of inlet (36–54%) > middle (26–35%) > outlet (20–31%), except for Cd in the Zn–Cd binary system. The result of SEP revealed that most of the retained Cd (98–99%) and Zn (56–71%) was in the labile fraction (e.g., the sum of F1 and F2) while only 9–12% of As(V) was labile and most (> 55%) was specifically adsorbed to Fe/Al oxides. Plots of the labile fraction (flabile) and the fast sorption fraction (ffast) suggested that the kinetics of specific As(V) sorption occur rapidly (ffast > flabile), whereas labile Zn and Cd sorption occurs slowly (flabile > ffast), indicating the occurrence of kinetically limited labile sorption sites, probably due to Zn–Cd competition. In conclusion, the element leaching potential of mine leachate can be greatly attenuated during downgradient soil seepage. However, when assessing the soil attenuation process, the impact of sorption competitors and the lability of adsorbed elements should first be considered.

ACS Style

Juhee Kim; Seung Mo Nam; Seunghun Hyun. Removal and co-transport of Zn, As(V), and Cd during leachate seepage through downgradient mine soils: A batch sorption and column study. Science of The Total Environment 2016, 551-552, 571 -578.

AMA Style

Juhee Kim, Seung Mo Nam, Seunghun Hyun. Removal and co-transport of Zn, As(V), and Cd during leachate seepage through downgradient mine soils: A batch sorption and column study. Science of The Total Environment. 2016; 551-552 ():571-578.

Chicago/Turabian Style

Juhee Kim; Seung Mo Nam; Seunghun Hyun. 2016. "Removal and co-transport of Zn, As(V), and Cd during leachate seepage through downgradient mine soils: A batch sorption and column study." Science of The Total Environment 551-552, no. : 571-578.

Journal article
Published: 01 September 2015 in Chemosphere
Reads 0
Downloads 0

Leaching of metallic elements (Cu, Zn, As, Cd, and Pb) from two mine-impacted soils (DY and BS) was evaluated by batch decant-refill and seepage flow experiments. During eight consecutive leaching steps, aqueous As concentrations remained relatively constant (approx. 1.6 and 0.1 mg L(-)(1) for DY and BS, respectively), while Cu (0.01-3.2 mg L(-1)), Zn (0.2-42 mg L(-1)), and Cd (0.004-0.3 mg L(-1)) were quickly reduced. The reduction of Pb concentration (0.007-0.02 mg L(-1) and 0.2-0.9 mg L(-1) for DY and BS, respectively) was much lesser. This pattern was well-explained by the biphasic leaching model by allocating a large fast leaching fraction (ffast>0.2) for Cu, Zn, and Cd while a negligible ffast for As and Pb (<0.001). For all elements in column effluents, mass export through first-flush and steady-state concentration were elevated under slow seepage, with the greatest impact observed for As. Element export was enhanced after flow interruption, especially under fast seepage. A transient drop in As export in slow seepage was likely due to sorption back to soil phase during the quiescent period. The ratio of Fe(2+)/Fe(3+) and SO4(2-) concentration, related to the dissolution of sulfide minerals, were also seepage rate-dependent. The results of batch and column studies imply that the leachate concentration will be enhanced by initial seepage and will be perturbed after quiescent wetting period. The conversion from kinetically leachable pool to readily leachable pool is likely responsible for nonequilibrium metal leaching from the long-term abandoned mine soils.

ACS Style

Juhee Kim; Seunghun Hyun. Nonequilibrium leaching behavior of metallic elements (Cu, Zn, As, Cd, and Pb) from soils collected from long-term abandoned mine sites. Chemosphere 2015, 134, 150 -158.

AMA Style

Juhee Kim, Seunghun Hyun. Nonequilibrium leaching behavior of metallic elements (Cu, Zn, As, Cd, and Pb) from soils collected from long-term abandoned mine sites. Chemosphere. 2015; 134 ():150-158.

Chicago/Turabian Style

Juhee Kim; Seunghun Hyun. 2015. "Nonequilibrium leaching behavior of metallic elements (Cu, Zn, As, Cd, and Pb) from soils collected from long-term abandoned mine sites." Chemosphere 134, no. : 150-158.

Journal article
Published: 30 June 2015 in Ecology and Resilient Infrastructure
Reads 0
Downloads 0
ACS Style

Wonjae Hwang; Minseok Park; Yong-Seong Kim; Kijong Cho; Woo-Kyun Lee; Seunghun Hyun. Analysis of Greenhouse Gas Emission Models and Evaluation of Their Application on Agricultural Lands in Korea. Ecology and Resilient Infrastructure 2015, 2, 185 -190.

AMA Style

Wonjae Hwang, Minseok Park, Yong-Seong Kim, Kijong Cho, Woo-Kyun Lee, Seunghun Hyun. Analysis of Greenhouse Gas Emission Models and Evaluation of Their Application on Agricultural Lands in Korea. Ecology and Resilient Infrastructure. 2015; 2 (2):185-190.

Chicago/Turabian Style

Wonjae Hwang; Minseok Park; Yong-Seong Kim; Kijong Cho; Woo-Kyun Lee; Seunghun Hyun. 2015. "Analysis of Greenhouse Gas Emission Models and Evaluation of Their Application on Agricultural Lands in Korea." Ecology and Resilient Infrastructure 2, no. 2: 185-190.

Journal article
Published: 02 June 2015 in Environmental Science and Pollution Research
Reads 0
Downloads 0

Applicability of cosolvency model for describing the sorption of organic acids to humic substance was investigated by analyzing dataset of sorption (K m) and solubility (S m) of selected solutes (benzoic acid, 1-naphthoic acid, 2,4-dichlorophenoxyacetic acid, and 2,4,6-trichlorophenol (2,4,6-TCP)) as a function of pH(appCME) (apparent pH of liquid phase) and f c (methanol volume fractions). For all solutes, the K m decreased with f c with the K m reduction being less than the S m-based prediction. The slope of log K m-f c plot in the three organic carboxylic acids was well correlated with their cosolvency power, whereas the data of organic phenolic acid (2,4,6-TCP) was placed above the trend, indicating the different actions of functional groups. The occurrence of Ca(2+) bridge between carboxylate and negatively charged humic surface may explain this phenomenon. Normalizing the K m to the corresponding S m (α' = K m/S m) was not in unity over the pH(app)-f c range but decreased with f c, indicating a possible structural modification of sorption domain favoring extra sorption. For a given solute, the α' of neutral species was always greater than that of anionic species, showing that extra interaction will be likely at pH(app)

ACS Style

Minhee Kim; Juhee Kim; Jeong-Gyu Kim; Seunghun Hyun. Factors influencing inapplicability of cosolvency-induced model on organic acid sorption onto humic substance from methanol mixture. Environmental Science and Pollution Research 2015, 22, 15745 -15754.

AMA Style

Minhee Kim, Juhee Kim, Jeong-Gyu Kim, Seunghun Hyun. Factors influencing inapplicability of cosolvency-induced model on organic acid sorption onto humic substance from methanol mixture. Environmental Science and Pollution Research. 2015; 22 (20):15745-15754.

Chicago/Turabian Style

Minhee Kim; Juhee Kim; Jeong-Gyu Kim; Seunghun Hyun. 2015. "Factors influencing inapplicability of cosolvency-induced model on organic acid sorption onto humic substance from methanol mixture." Environmental Science and Pollution Research 22, no. 20: 15745-15754.