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In this study, soils spiked with copper oxide nanoparticles (CuO NPs) or Cu(NO3)2 and aged as long as 90 days were utilized to investigate effect of soil properties and aging on oral and inhalation bioaccessibility of CuO NPs. Results showed that oral bioaccessibility of CuO NPs in gastric phase (GP) ranged from 70% to 84%, it significantly decreased to 50%–70% in intestinal phase (IP). The inhalation bioaccessibility of CuO NPs in artificial lysosomal fluid (ALF) ranged from 66% to 85%, and much higher than that in Gamble’s solution (GS, 3.3%–23%). By comparing CuO NPs to Cu(NO3)2 bioaccessibility, insignificant difference was found. The aging time (D15 and D90) had limited effect on their oral and inhalation bioaccessibility. CEC and free Al were positively and clay content was negatively correlated with CuO NPs inhalation bioaccessibility, while Cu(NO3)2 inhalation bioaccessibility decreased with increasing soil clay content and pH. Our findings provide an essential basis to evaluate the human health risks of CuO NPs.
Shiwei Li; Yanhua Qiu; Minghui Chang; Zongquan Sun; Fang He; Helian Li. Effect of Soil Properties and Aging Time on Oral and Inhalation Bioaccessibility of Copper Oxide Nanoparticles in Soils. Bulletin of Environmental Contamination and Toxicology 2021, 1 -8.
AMA StyleShiwei Li, Yanhua Qiu, Minghui Chang, Zongquan Sun, Fang He, Helian Li. Effect of Soil Properties and Aging Time on Oral and Inhalation Bioaccessibility of Copper Oxide Nanoparticles in Soils. Bulletin of Environmental Contamination and Toxicology. 2021; ():1-8.
Chicago/Turabian StyleShiwei Li; Yanhua Qiu; Minghui Chang; Zongquan Sun; Fang He; Helian Li. 2021. "Effect of Soil Properties and Aging Time on Oral and Inhalation Bioaccessibility of Copper Oxide Nanoparticles in Soils." Bulletin of Environmental Contamination and Toxicology , no. : 1-8.
Dissolution is the primary process affecting the bioavailability and toxicity of nanoscale copper oxide (nano-CuO) to plants and soil organisms. In this study, particle morphology, organic acid, and soil properties were considered to understand the dissolution characteristics of nano-CuO in soil solutions. The results showed that the copper ions (Cu2+) released from spherical nano-CuO (CuO NPs), tubular nano-CuO (CuO NTs), and spherical microsized CuO (CuO MPs) in the ten soil solutions were 26.6–4194.0 μg/L, 4.90–217.1 μg/L, and 10.8–326.0 μg/L, respectively. The concentration of Cu2+ was negatively correlated with the pH of the soil solution and positively correlated with the contents of dissolved organic carbon (DOC), aluminum, and manganese. Multivariate stepwise regression analysis indicated that the dissolution of CuO NPs could be well predicted by pH and DOC contents of the soil solutions. In the GD soil solution (acidic), 4- and 8-fold of the DOC content amendments significantly promoted the dissolution of the three sizes of CuOs, resulting in an increase of Cu2+ 4.55–11.3 and 5.67–16.2 times, respectively. In the CQ soil solution (neutral), 8-fold DOC amendments increase the release of Cu2+ 2.13–16.6 times. While in the SD soil solution (alkaline), promoting effect on the dissolution was only observed for nano-CuOs, with Cu2+ elevated by factors of 1.56–4.64 and 1.38–4.48. The amendments of Al3+ and Mn2+ in soil solution increased the amounts of Cu2+ 1.13–4.80 and 1.02–1.46 times in the GD soil solution. In comparison, no significant promoting effects were observed in CQ and SD soil solutions due to their stronger buffering capacities. These findings offer insight into the dissolution behavior of nano-CuOs in soils and be helpful to evaluate their environmental risks.
Meilan Xu; Yansu Wang; Zuting Mu; Shiwei Li; Helian Li. Dissolution of copper oxide nanoparticles is controlled by soil solution pH, dissolved organic matter, and particle specific surface area. Science of The Total Environment 2021, 772, 145477 .
AMA StyleMeilan Xu, Yansu Wang, Zuting Mu, Shiwei Li, Helian Li. Dissolution of copper oxide nanoparticles is controlled by soil solution pH, dissolved organic matter, and particle specific surface area. Science of The Total Environment. 2021; 772 ():145477.
Chicago/Turabian StyleMeilan Xu; Yansu Wang; Zuting Mu; Shiwei Li; Helian Li. 2021. "Dissolution of copper oxide nanoparticles is controlled by soil solution pH, dissolved organic matter, and particle specific surface area." Science of The Total Environment 772, no. : 145477.
Swine farms are one of the important sources of antibiotics in the environment. In this study, 42 samples of compound feed and feces of swine collected at different growth stages from intensive farms were evaluated for the occurrence and concentrations of three tetracyclines (TCs, namely oxytetracycline, chlortetracycline, and doxycycline) and three sulfonamides (SAs, namely sulfadiazine, sulfadimidine, and sulfamethoxazole). To check for other additional sources of antibiotic administration, ratios (R) of the measured and the predicted levels of each antibiotic excreted via feces were also estimated. Our results showed that the maximum concentration of TCs was 376,210 μg kg−1 and 541,020 μg kg−1 in the feeds and feces, respectively, both for oxytetracycline. In contrast, the highest concentration of SAs were 16.98 μg kg−1 for sulfadimidine in the feeds and 14.70 μg kg−1 for sulfadiazine in the feces. The concentrations of ΣTCs (sum of the three tetracyclines) in swine feeds and feces were found to be 1–4 orders of magnitude higher than those of ΣSAs (sum of the three sulfonamides). Approximately 36% of the R values were found to be greater than one, indicating other sources of administration such as injection and/or oral administration (via drinking water) may also contribute to the presence of antibiotics in feces. Most of the higher R values were found in starter pigs, which were generally administrated with antibiotics by multiple routes to prevent disease and promote swine growth. Our study suggests that comprehensive measures may be undertaken to control antibiotic use in intensive swine farms.
Meilan Xu; Helian Li; Shiwei Li; Cheng Li; Jinyang Li; Yibing Ma. The presence of tetracyclines and sulfonamides in swine feeds and feces: dependence on the antibiotic type and swine growth stages. Environmental Science and Pollution Research 2020, 27, 43093 -43102.
AMA StyleMeilan Xu, Helian Li, Shiwei Li, Cheng Li, Jinyang Li, Yibing Ma. The presence of tetracyclines and sulfonamides in swine feeds and feces: dependence on the antibiotic type and swine growth stages. Environmental Science and Pollution Research. 2020; 27 (34):43093-43102.
Chicago/Turabian StyleMeilan Xu; Helian Li; Shiwei Li; Cheng Li; Jinyang Li; Yibing Ma. 2020. "The presence of tetracyclines and sulfonamides in swine feeds and feces: dependence on the antibiotic type and swine growth stages." Environmental Science and Pollution Research 27, no. 34: 43093-43102.
Copper oxide nanoparticles (CuO NPs) in soil have received considerable attention because of their potential impact on the environment. In the present study, the stability of CuO NPs (50 nm and 80 nm) in eight soil solutions as well as the major influencing factors was investigated. The results showed that hetero-aggregation between natural colloids and NPs dominated the first stage of aggregation, afterwards the two different sized CuO NPs exhibited different aggregation behaviors. The aggregation of 80 nm CuO was inconspicuous except for notable aggregation observed in JX soil solution where the zeta potential of CuO NPs is close to zero. While for 50 nm CuO NPs, the aggregate size sharply decreased and the aggregates gradually reached a stable state. Further, the sedimentation rate and residual concentration of 50 nm CuO were found to be greater than those of 80 nm CuO. The residual amount of 80 nm CuO in the JX soil solution was lower than those in other soil solutions owing to the lowest zeta potential of the NPs. The pH of the soil solution has a significant effect on the stability of CuO NPs because of the shifting of the zeta potential of the NPs. In addition, dissolved organic carbon showed a statistically significant positive correlation with the residual concentration of CuO NPs. These findings imply the properties of CuO NPs as well as environmental factors including pH and DOC play key role in determining the fate, transport, and bioavailability of CuO NPs in soils.
Yanhua Qiu; Zuting Mu; Ning Wang; Xiaojun Wang; Meilan Xu; Helian Li. The aggregation and sedimentation of two different sized copper oxide nanoparticles in soil solutions: Dependence on pH and dissolved organic matter. Science of The Total Environment 2020, 731, 139215 .
AMA StyleYanhua Qiu, Zuting Mu, Ning Wang, Xiaojun Wang, Meilan Xu, Helian Li. The aggregation and sedimentation of two different sized copper oxide nanoparticles in soil solutions: Dependence on pH and dissolved organic matter. Science of The Total Environment. 2020; 731 ():139215.
Chicago/Turabian StyleYanhua Qiu; Zuting Mu; Ning Wang; Xiaojun Wang; Meilan Xu; Helian Li. 2020. "The aggregation and sedimentation of two different sized copper oxide nanoparticles in soil solutions: Dependence on pH and dissolved organic matter." Science of The Total Environment 731, no. : 139215.
Two commonly used dispersants, octyl phenol ethoxylate (Triton X-100) and sodium dodecyl sulfate (SDS), were employed to explore the effects of single or mixed surfactants on the dispersion, sedimentation and aggregation of multi-walled carbon nanotubes (MWCNTs). Non-ionic surfactant TX100 showed much superior capability to anionic surfactant SDS in dispersing MWCNTs due to the benzene ring structure in its tail group. The addition of SDS reduced the adsorption of TX100 on the surface of MWCNTs and the consequent suspension of MWCNTs. The dispersing ability of TX100–SDS binary mixture was between those of individual SDS and TX100. The introduction of SDS greatly retarded the sedimentation and aggregation of suspended MWCNTs. The critical coagulation concentration (CCC) values of suspended MWCNTs dispersed by TX100 (2000 mg l −1 ), SDS (2000 mg l −1 ) and TX100–SDS (2000 mg l −1 of each component) were 48.6, 398 and 324 mM, respectively, for Na + treatments. The CCC values were much lower for Ca 2+ treatments, which were 30.4 and 32.1 mM, respectively, for MWCNTs dispersed by TX100 and TX100–SDS mixture. Overall, these results demonstrated that although the introduction of SDS did not improve the ability of TX100 in suspending MWCNTs, the suspensions exhibited more stable properties than those dispersed by TX100 alone. Our findings have important implications for the design of surfactant mixtures and the prediction of the behaviour and fate of MWCNTs in the water environment.
Helian Li; Yanhua Qiu. Dispersion, sedimentation and aggregation of multi-walled carbon nanotubes as affected by single and binary mixed surfactants. Royal Society Open Science 2019, 6, 190241 .
AMA StyleHelian Li, Yanhua Qiu. Dispersion, sedimentation and aggregation of multi-walled carbon nanotubes as affected by single and binary mixed surfactants. Royal Society Open Science. 2019; 6 (7):190241.
Chicago/Turabian StyleHelian Li; Yanhua Qiu. 2019. "Dispersion, sedimentation and aggregation of multi-walled carbon nanotubes as affected by single and binary mixed surfactants." Royal Society Open Science 6, no. 7: 190241.
Dissolved organic matter (DOM) extracted from wheat straw (SDOM) and cow manure (MDOM) were used to investigate their effects on the solubilization, uptake, and translocation of 2,2',4,4'-tetrabromodiphenyl ether (BDE-47). Partition coefficients (KDOC) of BDE 47 between water and the two types of DOM were measured by the solubility enhancement method. The uptake and translocation of BDE 47 by wheat plants were explored by hydroponic exposure experiments. In the range of 0 to 100 mg/L of DOM, the solubility of BDE 47 increased with increasing concentrations of DOM. The log [KDOC] values of BDE 47 in SDOM and MDOM solutions were 5.77 and 5.31, respectively. The log [KDOC] values of BDE 47 in SDOM solutions were higher than those in MDOM solutions, which might be ascribed to the higher content of aliphatic carbon and lower molecular weight of SDOM. The addition of DOM (50 mg/L) significantly increased the accumulation of BDE 47 in the shoots of wheat plants. Wheat straw DOM had greater effect than MDOM in enhancing the accumulation of BDE 47. This study demonstrated the potential risk of BDE 47 to plants resulting from DOM-facilitated transport or the changes in metabolic properties.
Helian Li; Fengluan Shao; Yanhua Qiu; Yibing Ma. Solubility, uptake, and translocation of BDE 47 as affected by DOM extracted from agricultural wastes. Environmental Science and Pollution Research 2019, 26, 19871 -19878.
AMA StyleHelian Li, Fengluan Shao, Yanhua Qiu, Yibing Ma. Solubility, uptake, and translocation of BDE 47 as affected by DOM extracted from agricultural wastes. Environmental Science and Pollution Research. 2019; 26 (19):19871-19878.
Chicago/Turabian StyleHelian Li; Fengluan Shao; Yanhua Qiu; Yibing Ma. 2019. "Solubility, uptake, and translocation of BDE 47 as affected by DOM extracted from agricultural wastes." Environmental Science and Pollution Research 26, no. 19: 19871-19878.
There is increasing concern regarding soils contaminated with polycyclic aromatic hydrocarbons (PAHs). In the present study, the remediation of soil spiked with PAHs was explored by the combination of soil washing with sodium dodecyl sulfate (SDS) and subsequent oxidation through persulfate (PS) activated by Fe2+, nanoscale zero-valent iron (nZVI), and SiO2-coated nZVI (SiO2/nZVI). Results demonstrated that the removal of phenanthrene (PHE), fluoranthene (FLU), and pyrene (PYR) by SDS is an efficient means for soil decontamination. At SDS concentration of 20 g/L, the removal efficiencies of PHE, PYR, and FLU were 37%, 40%, and 44%, respectively. For the degradation of PAHs and SDS in the soil washing effluents, the efficiencies of PS activated with SiO2/nZVI were not significantly different from those of PS activated with nZVI and Fe2+ (p > 0.05). In practice, SiO2/nZVI is more preferable due to the improved antioxidation and dispersibility. At the dosage of 2 g/L (in the amount of iron) of SiO2/nZVI, the removal efficiencies of PHE, FLU, PYR, and SDS within 30 min of treatment were 75%, 85%, 87%, and 34%, respectively. The degradation of SDS was much lower than those of PAHs, which facilitated the recycle of SDS. Our findings suggest that PS activated with SiO2/nZVI is a promising method for the treatment of soil washing effluents containing SDS and PAHs.
Yanhua Qiu; Meilan Xu; Zongquan Sun; Helian Li. Remediation of PAH-Contaminated Soil by Combining Surfactant Enhanced Soil Washing and Iron-Activated Persulfate Oxidation Process. International Journal of Environmental Research and Public Health 2019, 16, 441 .
AMA StyleYanhua Qiu, Meilan Xu, Zongquan Sun, Helian Li. Remediation of PAH-Contaminated Soil by Combining Surfactant Enhanced Soil Washing and Iron-Activated Persulfate Oxidation Process. International Journal of Environmental Research and Public Health. 2019; 16 (3):441.
Chicago/Turabian StyleYanhua Qiu; Meilan Xu; Zongquan Sun; Helian Li. 2019. "Remediation of PAH-Contaminated Soil by Combining Surfactant Enhanced Soil Washing and Iron-Activated Persulfate Oxidation Process." International Journal of Environmental Research and Public Health 16, no. 3: 441.
Dissolved organic matters (DOMs) extracted from wheat straw (SDOM) and cow manure (MDOM) were used to investigate their effects on the suspension stability and aggregation of multi-walled carbon nanotubes (MWCNTs). Two types of DOM can effectively disperse and stabilize the MWCNTs. At initial MWCNT concentration of 500 mg/L, suspended MWCNT concentration ranged from 8.0 to 17.9 mg/L as DOM were varied from 50 to 200 mg/L dissolved organic carbon (DOC). The critical coagulation concentration (CCC) values were estimated to be 41.4 mM NaCl and 5.3 mM CaCl2 in the absence of DOM. The presence of SDOM and MDOM significantly retarded the aggregation rate of MWCNTs. The CCC values increased to 120 mM NaCl and 14.8 mM CaCl2 at SDOM concentration of 20 mg/L DOC. Due to its higher aromaticity and molecular weight, MDOM showed higher ability to stabilize MWCNTs, with CCC values of 201 mM and 15.8 mM at 20 mg/L DOC. These findings revealed that DOMs originated from agricultural wastes will have great impact on the dispersion and stabilization of MWCNTs, thus their fate in the aquatic environment.
Helian Li; Yanhua Qiu; Xiaonuan Wang; Wenhao Liu; Guangcai Chen; Yibing Ma; Baoshan Xing. Suspension stability and aggregation of multi-walled carbon nanotubes as affected by dissolved organic matters extracted from agricultural wastes. Environmental Pollution 2016, 210, 323 -329.
AMA StyleHelian Li, Yanhua Qiu, Xiaonuan Wang, Wenhao Liu, Guangcai Chen, Yibing Ma, Baoshan Xing. Suspension stability and aggregation of multi-walled carbon nanotubes as affected by dissolved organic matters extracted from agricultural wastes. Environmental Pollution. 2016; 210 ():323-329.
Chicago/Turabian StyleHelian Li; Yanhua Qiu; Xiaonuan Wang; Wenhao Liu; Guangcai Chen; Yibing Ma; Baoshan Xing. 2016. "Suspension stability and aggregation of multi-walled carbon nanotubes as affected by dissolved organic matters extracted from agricultural wastes." Environmental Pollution 210, no. : 323-329.
Field experiments were conducted to explore the effects of different sewage sludge amendment strategies on the accumulation and translocation of polybrominated diphenyl ethers (PBDEs) in soil-wheat systems. Two types of application methods (single or annual application) and four annual application rates (5, 10, 20, and 40 t ha(-1) year(-1)) were investigated. BDE 209 was detected in all of the sewage sludge amended soils and different parts of wheat plants collected from the contaminated soils. However, the other seven PBDE congeners (BDE 28, BDE 47, BDE 99, BDE 100, BDE 153, BDE 154, and BDE 183) were not detected or were only observed at very low levels. A single application of sewage sludge in large quantities would likely increase accumulation of BDE 209 in soil and its subsequent uptake and translocation by wheat. The concentrations of BDE 209 in soils, wheat roots and straws increased with the increasing sewage sludge application rate. There is a negative correlation between the root accumulation factors (the ratios of concentrations in wheat roots to those in soils) and soil total organic carbon (R(2)=0.84,P<0.05), demonstrating that the bioavailability of BDE 209 was controlled by the soil total organic carbon. BDE 209 concentrations in the grains from the sewage sludge amended soils were not significantly different from those of the control soils, suggesting that atmospheric deposition was the main source of BDE 209 detected in the grains.
Helian Li; Ronghui Qu; Liang-Guo Yan; Weilin Guo; Yibing Ma. Field study on the uptake and translocation of PBDEs by wheat (Triticum aestivum L.) in soils amended with sewage sludge. Chemosphere 2015, 123, 87 -92.
AMA StyleHelian Li, Ronghui Qu, Liang-Guo Yan, Weilin Guo, Yibing Ma. Field study on the uptake and translocation of PBDEs by wheat (Triticum aestivum L.) in soils amended with sewage sludge. Chemosphere. 2015; 123 ():87-92.
Chicago/Turabian StyleHelian Li; Ronghui Qu; Liang-Guo Yan; Weilin Guo; Yibing Ma. 2015. "Field study on the uptake and translocation of PBDEs by wheat (Triticum aestivum L.) in soils amended with sewage sludge." Chemosphere 123, no. : 87-92.
Wheat straw biochars produced at 400, 600 and 800°C (BC400, BC600 and BC800) were used to selectively adsorb PAHs from soil washing effluents. For soil washing effluents contained Phenanthrene (PHE), Fluoranthene (FLU), Pyrene (PYR) and Triton X-100 (TX100), biochars at 2 (for BC800) or 6 g L(-1) (for BC400 and BC600) can remove 71.8-98.6% of PAHs while recover more than 87% of TX100. PAH removals increase with increasing biochar dose. However, excess biochar is detrimental to the recovery of surfactant. For a specific biochar dose, PAH removal and TX100 loss increase with increasing pyrolytic temperature. For BC400 and BC600, PAH removal follows the order of PHE>FLU>PYR, while the order is reversed with PYR>FLU>PHE for BC800. Biochars have much higher sorption affinity for PAHs than for TX100. It is therefore suggested that biochar is a good alternative for selective adsorption of PAHs and recovery of TX100 in soil washing process.
Helian Li; Ronghui Qu; Chao Li; Weilin Guo; Xuemei Han; Fang He; Yibing Ma; Baoshan Xing. Selective removal of polycyclic aromatic hydrocarbons (PAHs) from soil washing effluents using biochars produced at different pyrolytic temperatures. Bioresource Technology 2014, 163, 193 -198.
AMA StyleHelian Li, Ronghui Qu, Chao Li, Weilin Guo, Xuemei Han, Fang He, Yibing Ma, Baoshan Xing. Selective removal of polycyclic aromatic hydrocarbons (PAHs) from soil washing effluents using biochars produced at different pyrolytic temperatures. Bioresource Technology. 2014; 163 ():193-198.
Chicago/Turabian StyleHelian Li; Ronghui Qu; Chao Li; Weilin Guo; Xuemei Han; Fang He; Yibing Ma; Baoshan Xing. 2014. "Selective removal of polycyclic aromatic hydrocarbons (PAHs) from soil washing effluents using biochars produced at different pyrolytic temperatures." Bioresource Technology 163, no. : 193-198.