Tags

Type your tag names separated by a space and hit enter

Distinct toxicity of silver nanoparticles and silver nitrate to Daphnia magna in M4 medium and surface water.
Sci Total Environ. 2018 Mar 15; 618:838-846.ST

Abstract

Toxicity of silver nanoparticles (AgNPs) has been studied in various culture media. However, these media notably differ from the natural aquatic system, thus the conclusions may be inapplicable for real environment condition. The toxicity and its underlying mechanism of AgNPs in surface waters warrant more investigations. This study investigated the acute toxicity, chronic toxicity, bioaccumulation, and alga-daphnia food chain transfer of citrate-coated AgNPs (C-AgNPs) and Ag+ (from AgNO3) to D. magna in a culture medium (M4) and a surface water sample. Results show that the acute toxicity in the surface water was significantly lower than that in the M4 medium and the toxicity of Ag+ was greatly higher than that of C-AgNPs. The 48h median effect concentration (EC50) of C-AgNPs to D. magna in the M4 medium and the surface water was 110±9.3μg/L and 270±26μg/L, respectively, while that of Ag+ was 1.8±0.7μg/L and 8.0±0.6μg/L, respectively. The released Ag+ contributed to but not dominated the acute toxicity of C-AgNPs. At the EC50 of C-AgNPs, the contribution of released Ag+ was 35.7% and 28.0% to the apparent nanotoxicity in the M4 medium and the surface water sample, respectively. The chronic toxicity of C-AgNPs and Ag+ was also lower in the surface water sample than in the M4 medium as indicated by the significantly higher survival of daphnia in the surface water during the 21d exposure. The daphnia took up less but depurated more Ag in the surface water than in the M4 medium, which could account for the lower toxicity in the surface water. Biological magnification of Ag through the alga-daphnia food chain was not observed. These findings will be helpful for assessing the environmental risk of AgNPs and understanding the mechanism of nanotoxcity.

Authors+Show Affiliations

Department of Environmental Science, Zhejiang University, Hangzhou 310058, China.Department of Environmental Science, Zhejiang University, Hangzhou 310058, China.Department of Environmental Science, Zhejiang University, Hangzhou 310058, China; Zhejiang Provincial Key Laboratory of Organic Pollution Process and Control, Zhejiang University, Hangzhou 310058, China.Department of Environmental Science, Zhejiang University, Hangzhou 310058, China; Zhejiang Provincial Key Laboratory of Organic Pollution Process and Control, Zhejiang University, Hangzhou 310058, China. Electronic address: lindaohui@zju.edu.cn.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

29054648

Citation

Hu, Yi, et al. "Distinct Toxicity of Silver Nanoparticles and Silver Nitrate to Daphnia Magna in M4 Medium and Surface Water." The Science of the Total Environment, vol. 618, 2018, pp. 838-846.
Hu Y, Chen X, Yang K, et al. Distinct toxicity of silver nanoparticles and silver nitrate to Daphnia magna in M4 medium and surface water. Sci Total Environ. 2018;618:838-846.
Hu, Y., Chen, X., Yang, K., & Lin, D. (2018). Distinct toxicity of silver nanoparticles and silver nitrate to Daphnia magna in M4 medium and surface water. The Science of the Total Environment, 618, 838-846. https://doi.org/10.1016/j.scitotenv.2017.08.222
Hu Y, et al. Distinct Toxicity of Silver Nanoparticles and Silver Nitrate to Daphnia Magna in M4 Medium and Surface Water. Sci Total Environ. 2018 Mar 15;618:838-846. PubMed PMID: 29054648.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Distinct toxicity of silver nanoparticles and silver nitrate to Daphnia magna in M4 medium and surface water. AU - Hu,Yi, AU - Chen,Xiangjie, AU - Yang,Kun, AU - Lin,Daohui, Y1 - 2017/10/18/ PY - 2017/07/15/received PY - 2017/08/20/revised PY - 2017/08/21/accepted PY - 2017/10/22/pubmed PY - 2018/8/24/medline PY - 2017/10/22/entrez KW - Acute toxicity KW - Bioaccumulation KW - Biological amplification KW - Chronic toxicity SP - 838 EP - 846 JF - The Science of the total environment JO - Sci Total Environ VL - 618 N2 - Toxicity of silver nanoparticles (AgNPs) has been studied in various culture media. However, these media notably differ from the natural aquatic system, thus the conclusions may be inapplicable for real environment condition. The toxicity and its underlying mechanism of AgNPs in surface waters warrant more investigations. This study investigated the acute toxicity, chronic toxicity, bioaccumulation, and alga-daphnia food chain transfer of citrate-coated AgNPs (C-AgNPs) and Ag+ (from AgNO3) to D. magna in a culture medium (M4) and a surface water sample. Results show that the acute toxicity in the surface water was significantly lower than that in the M4 medium and the toxicity of Ag+ was greatly higher than that of C-AgNPs. The 48h median effect concentration (EC50) of C-AgNPs to D. magna in the M4 medium and the surface water was 110±9.3μg/L and 270±26μg/L, respectively, while that of Ag+ was 1.8±0.7μg/L and 8.0±0.6μg/L, respectively. The released Ag+ contributed to but not dominated the acute toxicity of C-AgNPs. At the EC50 of C-AgNPs, the contribution of released Ag+ was 35.7% and 28.0% to the apparent nanotoxicity in the M4 medium and the surface water sample, respectively. The chronic toxicity of C-AgNPs and Ag+ was also lower in the surface water sample than in the M4 medium as indicated by the significantly higher survival of daphnia in the surface water during the 21d exposure. The daphnia took up less but depurated more Ag in the surface water than in the M4 medium, which could account for the lower toxicity in the surface water. Biological magnification of Ag through the alga-daphnia food chain was not observed. These findings will be helpful for assessing the environmental risk of AgNPs and understanding the mechanism of nanotoxcity. SN - 1879-1026 UR - https://www.unboundmedicine.com/medline/citation/29054648/Distinct_toxicity_of_silver_nanoparticles_and_silver_nitrate_to_Daphnia_magna_in_M4_medium_and_surface_water_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0048-9697(17)32220-9 DB - PRIME DP - Unbound Medicine ER -