Methylmercury Photodegradation in Surface Water of the Florida Everglades: Importance of Dissolved Organic Matter-Methylmercury Complexation
文献类型：期刊论文
| 作者 | Tai, Chao ; Li, Yanbin ; Yin, Yongguang ; Scinto, Leonard J. ; Jiang, Guibin ; Cai, Yong |
| 刊名 | ENVIRONMENTAL SCIENCE & TECHNOLOGY
 |
| 出版日期 | 2014 |
| 卷号 | 48期号:13页码:7333-7340 |
| ISSN号 | 0013-936X |
| 中文摘要 | Photodegradation is the major pathway of methylmercury (MeHg) degradation in many surface waters. However, the mechanism of MeHg photodegradation is still not completely understood. Dissolved organic matter (DOM) is expected to play a critical role in MeHg photodegradation. By using several techniques, including N-2/O-2 purging and the addition of stable isotope ((MeHg)-Hg-201), scavengers, competing ligands, and a singlet oxygen (O-1(2)) generator, the role played by MeHg-DOM complexation in MeHg photodegradation of Everglades surface water was investigated. DOM appeared to be involved in MeHg photodegradation via the formation MeHg-DOM complexes based on three findings: (1) MeHg was quickly photodegraded in solutions containing DOM extracts; (2) degradation of MeHg did not occur in deionized water; and (3) addition of competing complexation reagents (dithiothreitol-DTT) dramatically prohibited the photodegradation of MeHg in Everglades water. Further experiments indicated that free radicals/reactive oxygen species, including hydroxyl radical (center dot OH), O-1(2), triplet excited state of DOM ((DOM)-D-3*), and hydrated electron (e(aq)(-)), played a minor role in MeHg photodegradation in Everglades water, based on the results of scavenger addition, O-1(2) generator addition and N-2/O-2 purging. A pathway, involving direct photodegradation of MeHg-DOM complexes via intramolecular electron transfer, is proposed as the dominant mechanism for MeHg photodegradation in Everglades water. |
| WOS记录号 | WOS:000338488700019 |
| 公开日期 | 2015-03-26 |
| 源URL | [http://ir.rcees.ac.cn/handle/311016/9569]  |
| 专题 | 生态环境研究中心_环境水质学国家重点实验室 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 | Tai, Chao,Li, Yanbin,Yin, Yongguang,et al. Methylmercury Photodegradation in Surface Water of the Florida Everglades: Importance of Dissolved Organic Matter-Methylmercury Complexation[J]. ENVIRONMENTAL SCIENCE & TECHNOLOGY,2014,48(13):7333-7340. |
| APA | Tai, Chao,Li, Yanbin,Yin, Yongguang,Scinto, Leonard J.,Jiang, Guibin,&Cai, Yong.(2014).Methylmercury Photodegradation in Surface Water of the Florida Everglades: Importance of Dissolved Organic Matter-Methylmercury Complexation.ENVIRONMENTAL SCIENCE & TECHNOLOGY,48(13),7333-7340. |
| MLA | Tai, Chao,et al."Methylmercury Photodegradation in Surface Water of the Florida Everglades: Importance of Dissolved Organic Matter-Methylmercury Complexation".ENVIRONMENTAL SCIENCE & TECHNOLOGY 48.13(2014):7333-7340. |
入库方式： OAI收割
来源：生态环境研究中心
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