Exposure Medium: Key in Identifying Free Ag+ as the Exclusive Species of Silver Nanoparticles with Acute Toxicity to Daphnia magna
文献类型：期刊论文
| 作者 | Shen, Mo-Hai; Zhou, Xiao-Xia; Yang, Xiao-Ya; Chao, Jing-Bo; Liu, Rui; Liu, Jing-Fu |
| 刊名 | SCIENTIFIC REPORTS
 |
| 出版日期 | 2015-04-10 |
| 卷号 | 5期号:1页码:- |
| 英文摘要 | It is still not very clear what roles the various Ag species play in the toxicity of silver nanoparticles (AgNPs). In this study, we found that traditional exposure media result in uncontrollable but consistent physicochemical transformation of AgNPs, causing artifacts in determination of median lethal concentration (LC50) and hindering the identification of Ag species responsible for the acute toxicity of AgNPs to Daphnia magna. This obstacle was overcome by using 8 h exposure in 0.1 mmol L-1 NaNO3 medium, in which we measured the 8-h LC50 of seven AgNPs with different sizes and coatings, and determined the concentrations of various Ag species. The LC50 as free Ag+ of the seven AgNPs (0.37-0.44 mu g L-1) agreed very well with that of AgNO3 (0.40 mu g L-1), and showed the lowest value compared to that as total Ag, total Ag+, and dissolved Ag, demonstrating free Ag+ is exclusively responsible for the acute toxicity of AgNPs to D. magna, while other Ag species in AgNPs have no contribution to the acute toxicity. Our results demonstrated the great importance of developing appropriate exposure media for evaluating risk of nanomaterials. |
| 研究领域[WOS] | Multidisciplinary Sciences |
| WOS记录号 | WOS:000352641000001 |
| 公开日期 | 2016-03-15 |
| 源URL | [http://ir.rcees.ac.cn/handle/311016/32575]  |
| 专题 | 生态环境研究中心_环境化学与生态毒理学国家重点实验室 |
| 推荐引用方式 GB/T 7714 | Shen, Mo-Hai,Zhou, Xiao-Xia,Yang, Xiao-Ya,et al. Exposure Medium: Key in Identifying Free Ag+ as the Exclusive Species of Silver Nanoparticles with Acute Toxicity to Daphnia magna[J]. SCIENTIFIC REPORTS,2015,5(1):-. |
| APA | Shen, Mo-Hai,Zhou, Xiao-Xia,Yang, Xiao-Ya,Chao, Jing-Bo,Liu, Rui,&Liu, Jing-Fu.(2015).Exposure Medium: Key in Identifying Free Ag+ as the Exclusive Species of Silver Nanoparticles with Acute Toxicity to Daphnia magna.SCIENTIFIC REPORTS,5(1),-. |
| MLA | Shen, Mo-Hai,et al."Exposure Medium: Key in Identifying Free Ag+ as the Exclusive Species of Silver Nanoparticles with Acute Toxicity to Daphnia magna".SCIENTIFIC REPORTS 5.1(2015):-. |
入库方式： OAI收割
来源：生态环境研究中心
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