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Dimethylmonothioarsinic acid (DMMTA(V)) and dimethyldithioarsinic acid (DMDTA(V)), which are commonly found in landfill leachate and pore water of rice paddy soil, have attracted considerable attention for their high toxicity. This study aims to evaluate the behavior and potential risks of DMMTA(V) and DMDTA(V) in the environment by conducting an equilibrium sorption test using 2-line ferrihydrite and acute toxicity (immobilization) test using Daphnia magna. The overall maximum sorption capacity (qm) derived by the Langmuir isotherm model showed an increase in the order of inorganic arsenate (As(V)) > dimethylarsinic acid (DMA(V)) > DMMTA(V) > DMDTA(V), which was likely due to steric hindrance due to the presence of methyl and thiol groups. Moreover, DMMTA(V) and DMDTA(V) showed no or negligible change in qm with pH change, while qm decreased rapidly with increasing pH in As(V) and DMA(V). The 50% inhibition concentrations (IC50) for As(V), DMA(V), DMMTA(V), and DMDTA(V), which were measured after 48 h exposure to D. magna, were 9.5, > 30, 1.7, and 6.5 mg/L, respectively. Overall, the results demonstrated that DMMTA(V) and DMDTA(V) have high mobility and eco-toxicity in the environment and that methylated thioarsenicals should be accurately monitored and controlled.
Sang-Gyu Yoon; Ye-Eun Kim; Changwon Chae; Jinsung An; Hye-On Yoon. Dimethylmonothioarsinic acid and dimethyldithioarsinic acid in the environment: Sorption characteristics on 2-line ferrihydrite and acute toxicity to Daphnia magna. Environmental Geochemistry and Health 2021, 1 -8.
AMA StyleSang-Gyu Yoon, Ye-Eun Kim, Changwon Chae, Jinsung An, Hye-On Yoon. Dimethylmonothioarsinic acid and dimethyldithioarsinic acid in the environment: Sorption characteristics on 2-line ferrihydrite and acute toxicity to Daphnia magna. Environmental Geochemistry and Health. 2021; ():1-8.
Chicago/Turabian StyleSang-Gyu Yoon; Ye-Eun Kim; Changwon Chae; Jinsung An; Hye-On Yoon. 2021. "Dimethylmonothioarsinic acid and dimethyldithioarsinic acid in the environment: Sorption characteristics on 2-line ferrihydrite and acute toxicity to Daphnia magna." Environmental Geochemistry and Health , no. : 1-8.
The aim of this study was to compare leaching characteristics of metals from printed circuit boards (PCBs), taken from waste electrical and electronic equipment in the presence and in the absence of the iron-oxidizing bacteria, Acidithiobacillus ferrooxidans. A. ferrooxidans not only increases the leached concentration of Cu from the PCBs, but also inhibits the components of the 0K medium and leached Cu from forming precipitates such as libethenite (Cu2(PO4)(OH)), thereby assisting Cu recovery from the PCBs. In addition, the leached concentration of Pb from PCBs decreased in the presence of A. ferrooxidans, due to Pb forming amorphous precipitates. It is expected that Pb is not highly toxic to A. ferrooxidans. Consequently, A. ferrooxidans can be used as a cost-effective and environmentally friendly way to leach out valuable metals from PCBs as low-grade urban ore.
Jinsung An. Characteristics of Metals Leached from Waste Printed Circuit Boards Using Acidithiobacillus ferrooxidans. Minerals 2021, 11, 224 .
AMA StyleJinsung An. Characteristics of Metals Leached from Waste Printed Circuit Boards Using Acidithiobacillus ferrooxidans. Minerals. 2021; 11 (2):224.
Chicago/Turabian StyleJinsung An. 2021. "Characteristics of Metals Leached from Waste Printed Circuit Boards Using Acidithiobacillus ferrooxidans." Minerals 11, no. 2: 224.
High levels of fluorine in soil may pose health risks and require remediation. In this study, the feasibility of using a practical chemical washing method for the removal of fluorine from an enriched soil was evaluated. The chemical washing procedures were optimized through experimental analyses of various washing solutions and washing conditions (i.e., washing solution concentration, solid–liquid ratio, agitation speed, and reaction time). Additionally, the effects of techniques for improving the washing efficiency, such as ultrasonic washing, aeration, and multi-stage washing, were evaluated. Herein, among all applied methodologies, the maximum washing efficiency achieved for the total fluorine present in soil was only 6.2%, which indicated that chemical washing was inefficient in remediating this particular soil. Further sequential extraction analysis showed that the fluorine in this soil was present in a chemically stable form (residual fraction), possibly because of the presence of mica minerals. It was demonstrated that chemical washing may not be effective for remediating soils containing such chemically stable forms of fluorine. In these cases, other physical-based remediation technologies or risk management approaches may be more suitable.
Dong-Jun Baek; Ye-Eun Kim; Moon-Young Jung; Hye-On Yoon; Jinsung An. Feasibility of a Chemical Washing Method for Treating Soil Enriched with Fluorine Derived from Mica. Minerals 2021, 11, 134 .
AMA StyleDong-Jun Baek, Ye-Eun Kim, Moon-Young Jung, Hye-On Yoon, Jinsung An. Feasibility of a Chemical Washing Method for Treating Soil Enriched with Fluorine Derived from Mica. Minerals. 2021; 11 (2):134.
Chicago/Turabian StyleDong-Jun Baek; Ye-Eun Kim; Moon-Young Jung; Hye-On Yoon; Jinsung An. 2021. "Feasibility of a Chemical Washing Method for Treating Soil Enriched with Fluorine Derived from Mica." Minerals 11, no. 2: 134.
In this study, light intensities of Aliivibrio fischeri obtained from soil suspension and its filtrate were compared using field soils contaminated with heavy metals. The soils collected from rice paddy and forest had different soil textures with either high or low silt/clay content. The correlation between soil toxicity and soil solution toxicity for A. fischeri showed a high linearity in sandy soils with the slope of 0.586 (determination coefficient; R2 = 0.709). Meanwhile, a lower correlation in silty/clay soils with the slope of 0.154 (R2 = 0.067) was observed. When a solid phase bioluminescence inhibition test is carried out using soil suspension with a high silt/clay content, a large amount of A. fischeri seems to adhere to microparticles and/or microaggregates. It may result in the change of light intensity (i.e., distorted toxicity test result) that could not be corrected by the modified basic solid phase test protocol, and thus the toxicity is likely to be overestimated. Such alteration in the light intensity could be partially overcome using a regression equation accounting for microbial loss by adhesion. With the correction for microbial adhesion, the correlation between soil toxicity and soil solution toxicity in the selected soil samples with high silt/clay contents increased from 0.182 (R2 = 0.130) to 0.571 (R2 = 0.602). It is expected that soil toxicity can be evaluated through the prediction of soil solution toxicity after the proper correction of microparticles effects.
Jinsung An. False-Positive Error by Microparticles in Solid Phase Bioluminescence Inhibition Test and Its Correction for Predicting Soil Toxicity from Soil Solution Toxicity. Water, Air, & Soil Pollution 2020, 231, 1 -7.
AMA StyleJinsung An. False-Positive Error by Microparticles in Solid Phase Bioluminescence Inhibition Test and Its Correction for Predicting Soil Toxicity from Soil Solution Toxicity. Water, Air, & Soil Pollution. 2020; 231 (11):1-7.
Chicago/Turabian StyleJinsung An. 2020. "False-Positive Error by Microparticles in Solid Phase Bioluminescence Inhibition Test and Its Correction for Predicting Soil Toxicity from Soil Solution Toxicity." Water, Air, & Soil Pollution 231, no. 11: 1-7.
The bioaccessibility of As in soil, rather than its total concentration, is closely related to its potential risk. In this study, the in situ formation of amorphous Fe oxides was applied to As-contaminated soil to induce As-Fe coprecipitates that can withstand the gastric digestion condition of human beings. To promote the formation of Fe oxides, 2% ferric nitrate (w/w) and 30% water (v/w) were introduced, and the pH was adjusted to ~7. The chemical extractability of As in soil was determined using the solubility/bioavailability research consortium method and five-step sequential extraction. In situ formation of Fe oxides resulted in a remarkable increase in the As associated with amorphous Fe oxides, decreasing most of the exchangeable As (i.e., the sum of SO42− and PO43− extractable As), and thereby reducing the bioaccessibility of As. The types of association between As and Fe oxides were investigated using X-ray absorption spectroscopy analysis. Linear combination fit (LCF) analysis demonstrated that As bound to amorphous Fe oxides could exist as coprecipitates with ferrihydrite and schwertmannite after stabilization. The bioaccessibility of the coprecipitated As in soil further decreased as amorphous Fe oxides transformed to crystalline form with time, which was supported by the LCF results showing an increase of goethite in aged soil.
Jinhee Park; Jinsung An; HyeonYong Chung; Sang Hyun Kim; Kyoungphile Nam. Reduction of bioaccessibility of As in soil through in situ formation of amorphous Fe oxides and its long-term stability. Science of The Total Environment 2020, 745, 140989 .
AMA StyleJinhee Park, Jinsung An, HyeonYong Chung, Sang Hyun Kim, Kyoungphile Nam. Reduction of bioaccessibility of As in soil through in situ formation of amorphous Fe oxides and its long-term stability. Science of The Total Environment. 2020; 745 ():140989.
Chicago/Turabian StyleJinhee Park; Jinsung An; HyeonYong Chung; Sang Hyun Kim; Kyoungphile Nam. 2020. "Reduction of bioaccessibility of As in soil through in situ formation of amorphous Fe oxides and its long-term stability." Science of The Total Environment 745, no. : 140989.
The bioaccessibility of heavy metals in soil is closely related to their potential risk. Therefore, developing techniques for reducing it needs considerable attention. In this study, we aimed to co-precipitate soil As(V) through an in situ formation of Fe oxides, thereby reducing its bioaccessibility. Soil As(V) was co-precipitated by introducing 2% Fe-nitrate (w/w) and 30% water (v/w) into soil at pH ~7. Two different neutralizing agents (NaOH and CaO) were used to induce the precipitation of Fe oxides, and their effects on the speciation of As were investigated. In all the stabilized soils, the exchangeable As fraction decreased, and the fraction of As bound to amorphous Fe oxides increased by a factor of more than 1.4. In contrast, a marked decrease in bioaccessibility of As was achieved using NaOH (40% to 7%). X-ray absorption spectroscopy analysis demonstrated that highly bioaccessible forms of calcium iron arsenate (yukonite and arseniosiderite) could be generated in CaO-stabilized soil. Our study found that neutralizing agents may play an important role in stabilizing As(V) and lowering its bioaccessibility through determining the type of formed Fe oxides in soil.
Jinhee Park; HyeonYong Chung; Sang Hyun Kim; Jinsung An; Kyoungphile Nam. Effect of neutralizing agents on the type of As co-precipitates formed by in situ Fe oxides synthesis and its impact on the bioaccessibility of As in soil. Science of The Total Environment 2020, 743, 140686 .
AMA StyleJinhee Park, HyeonYong Chung, Sang Hyun Kim, Jinsung An, Kyoungphile Nam. Effect of neutralizing agents on the type of As co-precipitates formed by in situ Fe oxides synthesis and its impact on the bioaccessibility of As in soil. Science of The Total Environment. 2020; 743 ():140686.
Chicago/Turabian StyleJinhee Park; HyeonYong Chung; Sang Hyun Kim; Jinsung An; Kyoungphile Nam. 2020. "Effect of neutralizing agents on the type of As co-precipitates formed by in situ Fe oxides synthesis and its impact on the bioaccessibility of As in soil." Science of The Total Environment 743, no. : 140686.
Biotic ligand model (BLM) was extended to predict the toxicity of inorganic arsenate (iAs(V)) to the luminescent bacteria, Aliivibrio fischeri. As the pH increased from 5 to 9, the HAsO42- form predominated more than the H2AsO4- form did, and the EC50[As]T (50% effective iAs(V) concentration) decreased drastically from 3554 ± 393 to 39 ± 6 μM; thus, the HAsO42- form was more toxic to A. fischeri than H2AsO4-. As the HPO42- activity increased from 0 to 0.44 mM, the EC50{HAsO42-} values (50% effective HAsO42- activity) increased from 31 ± 6 to 859 ± 128 μM, indicating that the toxicity of iAs(V) decreased, owing to the competition caused by the structural similarity between iAs(V) and phosphate ions. However, activities of Ca2+, Mg2+, K+, SO42-, NO3-, and HCO3- did not significantly affect the EC50{HAsO42-} values. The BLM was reconstructed to take into account the effects of pH and phosphate, and the conditional binding constants for H2PO4-, HPO42-, H2AsO4-, and HAsO42- to the active binding sites of A. fischeri were obtained; 3.424 for logKXH2PO4, 4.588 for logKXHPO4, 3.067 for logKXH2AsO4, and 4.802 for logKXHAsO4. The fraction of active binding sites occupied by iAs(V) to induce 50% toxicity (fmix50%) was found to be 0.616.
Jinsung An; Buyun Jeong; Kyoungphile Nam. Extension of biotic ligand model to account for the effects of pH and phosphate in accurate prediction of arsenate toxicity. Journal of Hazardous Materials 2019, 385, 121619 .
AMA StyleJinsung An, Buyun Jeong, Kyoungphile Nam. Extension of biotic ligand model to account for the effects of pH and phosphate in accurate prediction of arsenate toxicity. Journal of Hazardous Materials. 2019; 385 ():121619.
Chicago/Turabian StyleJinsung An; Buyun Jeong; Kyoungphile Nam. 2019. "Extension of biotic ligand model to account for the effects of pH and phosphate in accurate prediction of arsenate toxicity." Journal of Hazardous Materials 385, no. : 121619.
Seulki Jeong; Hosub Lee; Youn-Tae Kim; Hye-On Yoon. Development of a simultaneous analytical method to determine arsenic speciation using HPLC-ICP-MS: Arsenate, arsenite, monomethylarsonic acid, dimethylarsinic acid, dimethyldithioarsinic acid, and dimethylmonothioarsinic acid. Microchemical Journal 2017, 134, 295 -300.
AMA StyleSeulki Jeong, Hosub Lee, Youn-Tae Kim, Hye-On Yoon. Development of a simultaneous analytical method to determine arsenic speciation using HPLC-ICP-MS: Arsenate, arsenite, monomethylarsonic acid, dimethylarsinic acid, dimethyldithioarsinic acid, and dimethylmonothioarsinic acid. Microchemical Journal. 2017; 134 ():295-300.
Chicago/Turabian StyleSeulki Jeong; Hosub Lee; Youn-Tae Kim; Hye-On Yoon. 2017. "Development of a simultaneous analytical method to determine arsenic speciation using HPLC-ICP-MS: Arsenate, arsenite, monomethylarsonic acid, dimethylarsinic acid, dimethyldithioarsinic acid, and dimethylmonothioarsinic acid." Microchemical Journal 134, no. : 295-300.
CO2 leakage monitoring is essential to ensure the environmental safety for CO2 capture and storage (CCS) technologies. This study aims to provide recommendations for the selection of analytical methods for monitoring of geochemical parameters at CCS sites. Five CCS sites are reviewed to investigate the changes in geochemistry following CO2 leakage. The following geochemical parameters were determined for monitoring CCS sites: alkalinity, electrical conductivity (EC), pH described as geochemical factors, and Ba, Ca, Fe, K, Mg, Mn, and Na contents, referred to as elements in this study. The international analytical methods provided by ISO, USEPA, and USGS, which are commonly used, are first compared, followed by. The considerations for selection of CCS-site-specific analytical methods were suggested, the water sample characteristics, recommended ranges, required equipment, and significant interference.
Seulki Jeong; Hyun A. Lee; Hye-On Yoon. Analytical methods for geochemical monitoring of CO2 capture and storage sites. Geosciences Journal 2017, 21, 631 -643.
AMA StyleSeulki Jeong, Hyun A. Lee, Hye-On Yoon. Analytical methods for geochemical monitoring of CO2 capture and storage sites. Geosciences Journal. 2017; 21 (4):631-643.
Chicago/Turabian StyleSeulki Jeong; Hyun A. Lee; Hye-On Yoon. 2017. "Analytical methods for geochemical monitoring of CO2 capture and storage sites." Geosciences Journal 21, no. 4: 631-643.
Jinsung An; Hosub Lee; Kyoungphile Nam; Hye-On Yoon. Effect of methanol addition on generation of isobaric polyatomic ions in the analysis of arsenic with ICP-MS. Microchemical Journal 2017, 131, 170 -173.
AMA StyleJinsung An, Hosub Lee, Kyoungphile Nam, Hye-On Yoon. Effect of methanol addition on generation of isobaric polyatomic ions in the analysis of arsenic with ICP-MS. Microchemical Journal. 2017; 131 ():170-173.
Chicago/Turabian StyleJinsung An; Hosub Lee; Kyoungphile Nam; Hye-On Yoon. 2017. "Effect of methanol addition on generation of isobaric polyatomic ions in the analysis of arsenic with ICP-MS." Microchemical Journal 131, no. : 170-173.
A novel approach using wavelength dispersive X-ray fluorescence (WDXRF) spectrometry combined with an activated carbon (AC) disk was developed for the determination of total iodine concentrations in water samples. Dissolved iodine species (i.e., I(-) and IO3(-)) in water samples were preconcentrated on the AC disk and directly analyzed by WDXRF spectrometry. The adsorption behavior of I(-) and IO3(-) on the AC disk was assessed at varying pH levels (4, 6, and 8). The AC disks completely retained the I(-) and IO3(-) for all the pH levels tested. The calibration curve obtained from the iodine concentrations (i.e., 0, 20, 200, and 400 μg) of AC disks and the measured X-ray intensity from the WDXRF analysis showed a good linearity (R(2)=0.9960), with a relatively low limit of detection (0.575 μg). The durability of the AC disk for repeatable measurements was also assessed to validate the sustainability of the proposed method and consequently the measured X-ray intensity for the AC disks was constant until 8d of analysis time. The accuracy of the proposed AC-WDXRF method was confirmed by measuring iodine concentration spiked in drinking water using inductively coupled plasma-mass spectrometry (ICP-MS). The proposed method is simple, rapid, efficient, and environmental friendly for iodine analysis in water samples. As a precursor of disinfection by products (DBPs), it is important to determine the total iodine concentrations in raw water.
Junseok Lee; Jinsung An; Joo-Ae Kim; Hye-On Yoon. Effectiveness of activated carbon disk for the analysis of iodine in water samples using wavelength dispersive X-ray fluorescence spectrometry. Chemosphere 2016, 142, 72 -76.
AMA StyleJunseok Lee, Jinsung An, Joo-Ae Kim, Hye-On Yoon. Effectiveness of activated carbon disk for the analysis of iodine in water samples using wavelength dispersive X-ray fluorescence spectrometry. Chemosphere. 2016; 142 ():72-76.
Chicago/Turabian StyleJunseok Lee; Jinsung An; Joo-Ae Kim; Hye-On Yoon. 2016. "Effectiveness of activated carbon disk for the analysis of iodine in water samples using wavelength dispersive X-ray fluorescence spectrometry." Chemosphere 142, no. : 72-76.
Jinsung An; Junseok Lee; Hye-On Yoon. Strategies for overcoming limitations associated with fluorine determination in solid materials by conventional wavelength dispersive X-ray fluorescence spectrometry. Microchemical Journal 2015, 122, 76 -81.
AMA StyleJinsung An, Junseok Lee, Hye-On Yoon. Strategies for overcoming limitations associated with fluorine determination in solid materials by conventional wavelength dispersive X-ray fluorescence spectrometry. Microchemical Journal. 2015; 122 ():76-81.
Chicago/Turabian StyleJinsung An; Junseok Lee; Hye-On Yoon. 2015. "Strategies for overcoming limitations associated with fluorine determination in solid materials by conventional wavelength dispersive X-ray fluorescence spectrometry." Microchemical Journal 122, no. : 76-81.
Dimethyldithioarsinic acid (DMDTAV), present in such intense sources as municipal landfill leachate, has drawn a great deal of attention due to its abundant occurrence and different aspect of toxicity. The hydrosulfide (HS−) concentration in leachate was studied as a major variable affecting the formation of DMDTAV. To this end, the HPLC–ICPMS system equipped with the reversed-phase C18 column was used to determine DMDTAV. Simulated landfill leachates (SLLs) were prepared to cover a mature landfill condition with the addition of sodium sulfate and sulfide at varying concentrations in the presence of dimethylarsinic acid (DMAV). The concentration of sodium sulfide added in the SLLs generally exhibited a strong positive correlation with the concentration of DMDTAV. As such, the formation of DMDTAV in the SLLs is demonstrated to be controlled by the interactive relationship between DMAV and the HS−.
Jinsung An; Ki-Hyun Kim; Mihye Kong; Joo-Ae Kim; Jeoung Hwa Shin; Yun Gyong Ahn; Hye-On Yoon. Formation of dimethyldithioarsinic acid in a simulated landfill leachate in relation to hydrosulfide concentration. Environmental Geochemistry and Health 2015, 38, 255 -263.
AMA StyleJinsung An, Ki-Hyun Kim, Mihye Kong, Joo-Ae Kim, Jeoung Hwa Shin, Yun Gyong Ahn, Hye-On Yoon. Formation of dimethyldithioarsinic acid in a simulated landfill leachate in relation to hydrosulfide concentration. Environmental Geochemistry and Health. 2015; 38 (1):255-263.
Chicago/Turabian StyleJinsung An; Ki-Hyun Kim; Mihye Kong; Joo-Ae Kim; Jeoung Hwa Shin; Yun Gyong Ahn; Hye-On Yoon. 2015. "Formation of dimethyldithioarsinic acid in a simulated landfill leachate in relation to hydrosulfide concentration." Environmental Geochemistry and Health 38, no. 1: 255-263.
Jinsung An; Junseok Lee; Gyuri Lee; Kyoungphile Nam; Hye-On Yoon. Combined use of collision cell technique and methanol addition for the analysis of arsenic in a high-chloride-containing sample by ICP-MS. Microchemical Journal 2015, 120, 77 -81.
AMA StyleJinsung An, Junseok Lee, Gyuri Lee, Kyoungphile Nam, Hye-On Yoon. Combined use of collision cell technique and methanol addition for the analysis of arsenic in a high-chloride-containing sample by ICP-MS. Microchemical Journal. 2015; 120 ():77-81.
Chicago/Turabian StyleJinsung An; Junseok Lee; Gyuri Lee; Kyoungphile Nam; Hye-On Yoon. 2015. "Combined use of collision cell technique and methanol addition for the analysis of arsenic in a high-chloride-containing sample by ICP-MS." Microchemical Journal 120, no. : 77-81.
This study assessed the status of fluorine (F) in soil in the vicinity of a spillage of anhydrous hydrofluoric acid in Korea. Gaseous hydrogen fluoride dispersed was suspected to have contaminated the surrounding soil environment. Total and water soluble F concentrations in soil within a 1 km radius of the spillage were determined. Total F concentrations (mean=222±70.1 mg kg(-1)) were lower than the Korean limit value (i.e., 400 mg kg(-1)) and several reported measurements of background F concentrations in soils except for a single outlying case. Soluble F concentrations ranged from 0.111 to 6.40 mg kg(-1) (mean=2.20±1.80 mg kg(-1)). A negative correlation between the soluble F concentration of soil and distance from the spillage was observed. This indicates that the soluble F concentration has a crucial role in fractionating the F concentration arising from a 'non natural input' i.e., the spillage. The F content of rice samples seemed to be significantly influenced by the soluble F concentrations of soils. Rice samples collected from the control and affected areas contained 41 mg kg(-1) and 578 mg kg(-1) of total F, respectively.
Jinsung An; Hyun A Lee; Junseok Lee; Hye-On Yoon. Fluorine distribution in soil in the vicinity of an accidental spillage of hydrofluoric acid in Korea. Chemosphere 2015, 119, 577 -582.
AMA StyleJinsung An, Hyun A Lee, Junseok Lee, Hye-On Yoon. Fluorine distribution in soil in the vicinity of an accidental spillage of hydrofluoric acid in Korea. Chemosphere. 2015; 119 ():577-582.
Chicago/Turabian StyleJinsung An; Hyun A Lee; Junseok Lee; Hye-On Yoon. 2015. "Fluorine distribution in soil in the vicinity of an accidental spillage of hydrofluoric acid in Korea." Chemosphere 119, no. : 577-582.
In this study, facilitated extraction with enzyme was employed for the first time to extract fluorine (F) from plants. Feasibility of the proposed method for F analysis was assessed by comparing with the alkali fusion-ion selective electrode (ISE) method. In the extraction procedure, 30 mg of a protease and 0.1 g of a plant sample were added in 10 mL of deionized water. In the absence of sonication, the solution was mechanically shaken for 10 s. A variety of parameters (i.e., the amounts of enzymes used, physical treatment conditions applied, extraction time, temperature, and pH) were optimized to enhance the extraction efficiency of the proposed method. The suitability of the proposed method for various plant samples (i.e., grass, perilla, peanut, hot pepper, and eggplant) was also evaluated. The proposed method involves decreased operation time, simplified extraction procedures, and minimal consumption of hazardous reagents and solvents in comparison with other existing methods. Experimental results demonstrated that facilitated extraction with enzyme is appropriate for the rapid determination of F content in plant samples.
Junseok Lee; Jinsung An; Hye-On Yoon. Determination of fluorine contents in plant samples by means of facilitated extraction with enzyme. Talanta 2015, 132, 648 -652.
AMA StyleJunseok Lee, Jinsung An, Hye-On Yoon. Determination of fluorine contents in plant samples by means of facilitated extraction with enzyme. Talanta. 2015; 132 ():648-652.
Chicago/Turabian StyleJunseok Lee; Jinsung An; Hye-On Yoon. 2015. "Determination of fluorine contents in plant samples by means of facilitated extraction with enzyme." Talanta 132, no. : 648-652.
The objectives of this study were to quantitatively estimate the distribution of arsenic with its speciation and to identify potential pathways for transformation of arsenic species from samples of water, sediments, and plants in the ecosystem affected by the Cheongog Spring, where As(V) concentration reached levels up to 0.270 mg L−1. After flowing about 100 m downstream, the arsenic level showed a marked reduction to 0.044 mg L−1 (about 84% removal) without noticeable changes in major water chemistry. The field study and laboratory hydroponic experiments with the dominant emergent plants along the creek (water dropwort and thunbergian smartweed) indicated that arsenic distribution, reduction, and speciation appear to be controlled by, (i) sorption onto stream sediments in exchangeable fractions, (ii) bioaccumulation by and possible release from emergent plants, and (iii) transformation of As(V) to As(III) and organic species through biological activities.
Youn-Tae Kim; H.O. Yoon; C. Yoon; N.C. Woo. Arsenic species in ecosystems affected by arsenic-rich spring water near an abandoned mine in Korea. Environmental Pollution 2009, 157, 3495 -3501.
AMA StyleYoun-Tae Kim, H.O. Yoon, C. Yoon, N.C. Woo. Arsenic species in ecosystems affected by arsenic-rich spring water near an abandoned mine in Korea. Environmental Pollution. 2009; 157 (12):3495-3501.
Chicago/Turabian StyleYoun-Tae Kim; H.O. Yoon; C. Yoon; N.C. Woo. 2009. "Arsenic species in ecosystems affected by arsenic-rich spring water near an abandoned mine in Korea." Environmental Pollution 157, no. 12: 3495-3501.