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Sunlight-driven reduction of silver ion to silver nanoparticle by organic matter mitigates the acute toxicity of silver to Daphnia magna.
J Environ Sci (China). 2015 Sep 01; 35:62-68.JE

Abstract

Due to the unique antibacterial activities, silver nanoparticles (AgNPs) have been extensively used in commercial products. Anthropogenic activities have released considerable AgNPs as well as highly toxic silver ion (Ag(+)) into the aquatic environment. Our recent study revealed that ubiquitous natural organic matter (NOM) could reduce Ag(+) to AgNP under natural sunlight. However, the toxic effect of this process is not well understood. In this work, we prepared mixture solution of Ag(+) and AgNPs with varied Ag(+)% through the sunlight-driven reduction of Ag(+) by NOM and investigated the acute toxicity of the solutions on Daphnia magna. Formation of AgNPs was demonstrated and characterized by comprehensive techniques and the fraction of unconverted Ag(+) was determined by ultrafiltration-inductively coupled plasma mass spectrometry determination. The formation of AgNPs enhanced significantly with the increasing of solution pH and cumulative photosynthetically active radiation of sunlight. The toxicity of the resulting solution was further investigated by using freshwater crustacean D. magna as a model and an 8hr-median lethal concentration (LC50) demonstrated that the reduction of Ag(+) by NOM to AgNPs significantly mitigated the acute toxicity of silver. These results highlight the importance of sunlight and NOM in the fate, transformation and toxicity of Ag(+) and AgNPs, and further indicate that the acute toxicity of AgNPs should be mainly ascribed to the dissolved Ag(+) from AgNPs.

Authors+Show Affiliations

School of the Environment, Jiangsu University, Zhenjiang 212013, China; State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China. Electronic address: zhangzhen@ujs.edu.cn.School of the Environment, Jiangsu University, Zhenjiang 212013, China; State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China. Electronic address: ygyin@rcees.ac.cn.State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

26354693

Citation

Zhang, Zhen, et al. "Sunlight-driven Reduction of Silver Ion to Silver Nanoparticle By Organic Matter Mitigates the Acute Toxicity of Silver to Daphnia Magna." Journal of Environmental Sciences (China), vol. 35, 2015, pp. 62-68.
Zhang Z, Yang X, Shen M, et al. Sunlight-driven reduction of silver ion to silver nanoparticle by organic matter mitigates the acute toxicity of silver to Daphnia magna. J Environ Sci (China). 2015;35:62-68.
Zhang, Z., Yang, X., Shen, M., Yin, Y., & Liu, J. (2015). Sunlight-driven reduction of silver ion to silver nanoparticle by organic matter mitigates the acute toxicity of silver to Daphnia magna. Journal of Environmental Sciences (China), 35, 62-68. https://doi.org/10.1016/j.jes.2015.03.007
Zhang Z, et al. Sunlight-driven Reduction of Silver Ion to Silver Nanoparticle By Organic Matter Mitigates the Acute Toxicity of Silver to Daphnia Magna. J Environ Sci (China). 2015 Sep 1;35:62-68. PubMed PMID: 26354693.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Sunlight-driven reduction of silver ion to silver nanoparticle by organic matter mitigates the acute toxicity of silver to Daphnia magna. AU - Zhang,Zhen, AU - Yang,Xiaoya, AU - Shen,Mohai, AU - Yin,Yongguang, AU - Liu,Jingfu, Y1 - 2015/05/28/ PY - 2015/02/12/received PY - 2015/03/03/revised PY - 2015/03/03/accepted PY - 2015/9/11/entrez PY - 2015/9/12/pubmed PY - 2016/6/17/medline KW - Acute toxicity KW - Daphnia magna KW - Natural organic matter KW - Reduction KW - Silver ion KW - Silver nanoparticle SP - 62 EP - 68 JF - Journal of environmental sciences (China) JO - J Environ Sci (China) VL - 35 N2 - Due to the unique antibacterial activities, silver nanoparticles (AgNPs) have been extensively used in commercial products. Anthropogenic activities have released considerable AgNPs as well as highly toxic silver ion (Ag(+)) into the aquatic environment. Our recent study revealed that ubiquitous natural organic matter (NOM) could reduce Ag(+) to AgNP under natural sunlight. However, the toxic effect of this process is not well understood. In this work, we prepared mixture solution of Ag(+) and AgNPs with varied Ag(+)% through the sunlight-driven reduction of Ag(+) by NOM and investigated the acute toxicity of the solutions on Daphnia magna. Formation of AgNPs was demonstrated and characterized by comprehensive techniques and the fraction of unconverted Ag(+) was determined by ultrafiltration-inductively coupled plasma mass spectrometry determination. The formation of AgNPs enhanced significantly with the increasing of solution pH and cumulative photosynthetically active radiation of sunlight. The toxicity of the resulting solution was further investigated by using freshwater crustacean D. magna as a model and an 8hr-median lethal concentration (LC50) demonstrated that the reduction of Ag(+) by NOM to AgNPs significantly mitigated the acute toxicity of silver. These results highlight the importance of sunlight and NOM in the fate, transformation and toxicity of Ag(+) and AgNPs, and further indicate that the acute toxicity of AgNPs should be mainly ascribed to the dissolved Ag(+) from AgNPs. SN - 1001-0742 UR - https://www.unboundmedicine.com/medline/citation/26354693/Sunlight_driven_reduction_of_silver_ion_to_silver_nanoparticle_by_organic_matter_mitigates_the_acute_toxicity_of_silver_to_Daphnia_magna_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S1001-0742(15)00176-X DB - PRIME DP - Unbound Medicine ER -