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| 1 | 纳米Ag在四种不同性质土壤上的吸附行为研究显示文摘纳米Ag的大量生产和使用增加了其进入土壤环境的风险,其在土壤中的环境行为受纳米Ag胶体稳定性和土壤理化性质的影响。为探究纳米Ag颗粒在土壤上的吸附行为,选取四种不同理化性质的土壤,考察了土壤p H、有机质和二价阳离子Ca2+对纳米Ag在土壤上吸附的影响。结果表明,纳米Ag在酸性土壤的吸附量高于中性土壤,当土壤酸碱性相似时土壤有机质含量越高纳米Ag在其表面的吸附量越高,纳米Ag在四种土壤上的吸附等温线都能较好地利用Freundlich方程进行拟合;Ca2+的存在均增加了纳米Ag在四种土壤上的吸附量,Ca2+浓度在0.1~10 mmol·L-1范围内,纳米Ag在中性土壤上的吸附量随Ca2+浓度的增加而增加,而在酸性土壤上则随着Ca2+浓度的增加,出现先增加后减小的趋势。这一结果有助于了解纳米银在不同性质土壤上的吸附行为,为评价纳米Ag在环境中的毒性和生态风险提供了有用信息。 | 杜欢 王玉军 李程程 范婷婷 周东美 司友斌 | 2015 | 农业环境科学学报2015，34，6： | 5 |
| 2 | Dispersive liquid–liquid microextraction of silver nanoparticles in water using ionic liquid1-octyl-3-methylimidazolium hexafluorophosphate显示文摘Using the ionic liquid(IL)1-octyl-3-methylimidazolium hexafluorophosphate as the extractant and methanol as the dispersion solvent,a dispersive liquid–liquid microextraction method was developed to extract silver nanoparticles(AgN Ps)from environmental water samples.Parameters that influenced the extraction efficiency such as IL concentration,pH and extraction time were optimized.Under the optimized conditions,the highest extraction efficiency for AgN Ps was above 90% with an enrichment factor of >90.The extracted AgN Ps in the IL phase were identified by transmission electron microscopy and ultraviolet–visible spectroscopy,and quantified by inductively coupled plasma mass spectrometry after microwave digestion,with a detection limit of 0.01 μg/L.The spiked recovery of AgN Ps was 84.4% with a relative standard deviation(RSD)of 3.8%(n = 6)at a spiked level of 5 μg/L,and 89.7% with a RSD of 2.2%(n = 6)at a spiked level of 300 μg/L,respectively.Commonly existed environmental ions had a very limited influence on the extraction efficiency.The developed method was successfully applied to the analysis of Ag NPs in river water,lake water,and the influent and effluent of a wastewater treatment plant,with recoveries in the range of 71.0%–90.9% at spiking levels of 0.11–4.7 μg/L. | Sha Chen Yuanjing Sun Jingbo Chao Liping Cheng Yun Chen Jingfu Liu | 2016 | Journal of Environmental Sciences2016，28，3： | 2 |
| 3 | Comparative cytotoxicity of nanoparticles and ions to Escherichia coli in binary mixtures显示文摘The objective of this study was to understand toxicity of mixture of nanoparticles(NPs)(ZnO and TiO_2)and their ions to Escherichia coli. Results indicated the decrease in percentage growth of E. coli with the increase in concentration of NPs both in single and mixture setups.Even a small concentration of 1 mg/L was observed to be significantly toxic to E. coli in binary mixture setup(exposure concentration:1 mg/L ZnO and 1 mg/L TiO_2; 21.15% decrease in plate count concentration with respect to control). Exposure of E.coli to mixture of NPs at 1000 mg/L(i.e.,1000 mg/L ZnO and 1000 mg/L TiO_2)resulted in 99.63% decrease in plate count concentration with respect to control. Toxic effects of ions to E. coli were found to be lesser than their corresponding NPs. The percentage growth reduction was found to be 36% for binary mixture of zinc and titanium ions at the highest concentration(i.e.,803.0 mg/L Zn and593.3 mg/L Ti where ion concentrations are equal to the Zn ions present in 1000 mg/L ZnO NP solution and Ti^(+4) ions present in 1000 mg/L TiO_2 NP solution). Nature of mixture toxicity of the two NPs to E. coli was found to be antagonistic. The alkaline phosphatase(Alp)assay indicated that the maximum damage was observed when E. coli was exposed to 1000 mg/L of mixture of NPs. This study tries to fill the knowledge gap on information of toxicity of mixture of NPs to bacteria which has not been reported earlier. | Swati Srivastaua Arun Kumar | 2017 | Journal of Environmental Sciences2017，29，5： | 1 |
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