Effects of water chemistry on the dissolution of ZnO nanoparticles and their toxicity to Escherichia coli
Effects of water chemistry on the dissolution of ZnO nanoparticles and their toxicity to Escherichia coli
复制标题
水化学对纳米氧化锌溶解的影响及其对大肠杆菌的毒性
DOI：
10.1016/j.envpol.2012.10.026
复制
发表时间：
2013-02-01
影响因子：
8.9
通讯作者：
Zhu, Lizhong
中科院分区：
文献类型：
--
作者：
Li, Mei;Lin, Daohui;Zhu, Lizhong
纳米氧化锌的溶解是纳米氧化锌对水生生物毒性的重要因素。研究了pH、离子组成、溶解性有机物（DOM）等水化学因素对纳米氧化锌溶解性的影响及其对大肠杆菌（Escherichia coli）的毒性。大肠杆菌）在合成和天然水样品中进行了研究。结果表明，纳米氧化锌对大肠杆菌的毒性较低。大肠杆菌不仅依赖于游离Zn ~（2+），还依赖于共存的阳离子，共存的阳离子可降低Zn ~（2+）的毒性。提高溶液pH值、HPO 42-和DOM的浓度均能降低纳米ZnO释放的游离Zn 2+浓度，从而降低纳米ZnO的毒性。Ca ~（2+）和Mg ~（2+）均能显著降低Zn ~（2+）对E.杆菌这些结果突出了水化学对纳米氧化锌在天然沃茨中毒性评价的重要性。(C)2012爱思唯尔有限公司保留所有权利。
The dissolution of ZnO nanoparticles (nano-zno) plays an important role in the toxicity of nano-ZnO to the aquatic organisms. The effects of water chemistry such as pH, ionic components, and dissolved organic matter (DOM) on the dissolution of nano-ZnO and its toxicity to Escherichia coli (E. coli) were investigated in synthetic and natural water samples. The results showed that the toxicity of nano-ZnO to E. coli depended on not only free Zn2+ but also the coexisting cations which could reduce the toxicity of Zn2+. Increasing solution pH, HPO42-, and DOM reduced the concentration of free Zn2+ released from nano-ZnO, and thus lowered the toxicity of nano-ZnO. In addition, both Ca2+ and Mg2+ dramatically reduced the toxicity of Zn2+ to E. coli. These results highlight the importance of water chemistry on the toxicity evaluation of nano-ZnO in natural waters. (C) 2012 Elsevier Ltd. All rights reserved.