Sunlight-driven reduction of silver ion to silver nanoparticle by organic matter mitigates the acute toxicity of silver to Daphnia magna

CORC > 生态环境研究中心 > 中国科学院生态环境研究中心 > 环境化学与生态毒理学国家重点实验室

	Sunlight-driven reduction of silver ion to silver nanoparticle by organic matter mitigates the acute toxicity of silver to Daphnia magna
	Zhang, Zhen; Yang, Xiaoya; Shen, Mohai; Yin, Yongguang; Liu, Jingfu
刊名	JOURNAL OF ENVIRONMENTAL SCIENCES
	2015-09-01
卷号	35 页码:62-68
关键词	Silver nanoparticle Silver ion Reduction Natural organic matter Acute toxicity Daphnia magna
英文摘要	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 8 hr-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. (C) 2015 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V.
研究领域[WOS]	Environmental Sciences
WOS记录号	WOS:000362982300008
公开日期	2016-03-15
内容类型	期刊论文
源URL	[http://ir.rcees.ac.cn/handle/311016/32671]
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	Zhang, Zhen,Yang, Xiaoya,Shen, Mohai,et al. Sunlight-driven reduction of silver ion to silver nanoparticle by organic matter mitigates the acute toxicity of silver to Daphnia magna[J]. JOURNAL OF ENVIRONMENTAL SCIENCES,2015,35:62-68.
APA	Zhang, Zhen,Yang, Xiaoya,Shen, Mohai,Yin, Yongguang,&Liu, Jingfu.(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,35,62-68.
MLA	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 35(2015):62-68.