| Mercury reduction and complexation by natural organic matter in anoxic environments | |
| Gu, Baohua1; Bian, Yongrong1,2; Miller, Carrie L.1; Dong, Wenming1; Jiang, Xin2; Liang, Liyuan1 | |
| 刊名 | PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
 |
| 2011-01-25 | |
| 卷号 | 108期号:4页码:1479-1483 |
| 关键词 | Hg-dissolved organic matter complex environmental factors methylation redox |
| ISSN号 | 0027-8424 |
| DOI | 10.1073/pnas.1008747108 |
| 通讯作者 | Gu, Baohua(gub1@ornl.gov) |
| 英文摘要 | Mercuric Hg(II) species form complexes with natural dissolved organic matter (DOM) such as humic acid (HA), and this binding is known to affect the chemical and biological transformation and cycling of mercury in aquatic environments. Dissolved elemental mercury, Hg(0), is also widely observed in sediments and water. However, reactions between Hg(0) and DOM have rarely been studied in anoxic environments. Here, under anoxic dark conditions we show strong interactions between reduced HA and Hg(0) through thiolate ligand-induced oxidative complexation with an estimated binding capacity of similar to 3.5 mu mol Hg/g HA and a partitioning coefficient >10(6) mL/g. We further demonstrate that Hg(II) can be effectively reduced to Hg(0) in the presence of as little as 0.2 mg/L reduced HA, whereas production of Hg(0) is inhibited by complexation as HA concentration increases. This dual role played by DOM in the reduction and complexation of mercury is likely widespread in anoxic sediments and water and can be expected to significantly influence the mercury species transformations and biological uptake that leads to the formation of toxic methylmercury. |
| 收录类别 | SCI |
| WOS关键词 | DISSOLVED GASEOUS MERCURY ; EXTRACELLULAR ELECTRON-TRANSFER ; HUMIC SUBSTANCES ; REDUCING BACTERIA ; MICROBIAL RESPIRATION ; ESTUARINE SEDIMENT ; METHYLATION ; HG(II) ; SOIL ; SULFUR |
| WOS研究方向 | Science & Technology - Other Topics |
| WOS类目 | Multidisciplinary Sciences |
| 语种 | 英语 |
| 出版者 | NATL ACAD SCIENCES |
| WOS记录号 | WOS:000286594800052 |
| 内容类型 | 期刊论文 |
| URI标识 | http://www.corc.org.cn/handle/1471x/2559019 |
| 专题 | 南京土壤研究所 |
| 通讯作者 | Gu, Baohua |
| 作者单位 | 1.Oak Ridge Natl Lab, Div Environm Sci, Oak Ridge, TN 37831 USA 2.Chinese Acad Sci, Inst Soil Sci, Nanjing 210008, Peoples R China |
| 推荐引用方式 GB/T 7714 | Gu, Baohua,Bian, Yongrong,Miller, Carrie L.,et al. Mercury reduction and complexation by natural organic matter in anoxic environments[J]. PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,2011,108(4):1479-1483. |
| APA | Gu, Baohua,Bian, Yongrong,Miller, Carrie L.,Dong, Wenming,Jiang, Xin,&Liang, Liyuan.(2011).Mercury reduction and complexation by natural organic matter in anoxic environments.PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,108(4),1479-1483. |
| MLA | Gu, Baohua,et al."Mercury reduction and complexation by natural organic matter in anoxic environments".PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA 108.4(2011):1479-1483. |
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