Critical role of natural organic matter in photodegradation of methylmercury in water: Molecular weight and interactive effects with other environmental factors

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

	Critical role of natural organic matter in photodegradation of methylmercury in water: Molecular weight and interactive effects with other environmental factors
	Cai, Yong; Zhang, Dan; Yin, Yongguang; Li, Yanbin; Liu, Jingfu
刊名	SCIENCE OF THE TOTAL ENVIRONMENT
	2017-05-15
卷号	578 期号:0 页码:535-541
关键词	Methylmercury Photodegradation Natural Organic Matter Molecular Weight Iron
英文摘要	Photodegradation is the main depletion pathway of methylmercury (MeHg) in surface water. However, the underlying mechanism of MeHg photodegradation is still not well understood. In this study, the critical role of natural organic matter (NOM) from Suwannee River natural organic matter of the International Humic Substance Society, especially its molecular weight, and the impacts of other related environmental factors in MeHg photodegradation were investigated. We observed that MeHg cannot photo-degrade in de-ionized water, excluding the direct photodegradation of MeHg. While either NOM or Fe3+ alone induced MeHg photodegradation, co-existing NOM significantly inhibited the Fe3+-induced degradation, highlighting the critical and complex role of NOM in MeHg photodegradation. Additionally, MeHg exhibited different photodegradation rates in the presence of molecular weight fractionated natural organic matter (M-f-NOM). More importantly, high concentration of NOM caused light attenuation significantly inhibited the photodegradation of MeHg, which was more significant for high molecular weight M-f-NOM. In the presence of M-f-NOM, MeHg photodegradation was also affected by light quality, pH and co-existing Cl- and NO3- The study is helpful for a better understanding of the critical role of NOM and other environmental factors on MeHg photodegradation in surface water. (C) 2016 Elsevier B.V. All rights reserved.
内容类型	期刊论文
源URL	[http://ir.rcees.ac.cn/handle/311016/39281]
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	Cai, Yong,Zhang, Dan,Yin, Yongguang,et al. Critical role of natural organic matter in photodegradation of methylmercury in water: Molecular weight and interactive effects with other environmental factors[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2017,578(0):535-541.
APA	Cai, Yong,Zhang, Dan,Yin, Yongguang,Li, Yanbin,&Liu, Jingfu.(2017).Critical role of natural organic matter in photodegradation of methylmercury in water: Molecular weight and interactive effects with other environmental factors.SCIENCE OF THE TOTAL ENVIRONMENT,578(0),535-541.
MLA	Cai, Yong,et al."Critical role of natural organic matter in photodegradation of methylmercury in water: Molecular weight and interactive effects with other environmental factors".SCIENCE OF THE TOTAL ENVIRONMENT 578.0(2017):535-541.