Reduction of mercury (II) by humic substances-influence of pH, salinity of aquatic system

被引：27

作者：

Chakraborty, Parthasarathi ^{[1
]}

Vudamala, Krushna ^{[1
]}

Coulibaly, Mariame ^{[1
,2
]}

Ramteke, Darwin ^{[1
]}

Chennuri, Kartheek ^{[1
]}

Lean, David ^{[3
]}

机构：

[1] Natl Inst Oceanog India, CSIR, Panaji 403004, Goa, India

[2] Ecole Normale Super, Abidjan 22, Cote Ivoire

[3] Lean Environm, Apsley, ON K0L 1A0, Canada

来源：

ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH | 2015年 / 22卷 / 14期

关键词：

Gaseousmercury capture; Reduction ofmercury; Mercury evasion; Mercury-humics interaction; Elemental mercury; DISSOLVED GASEOUS MERCURY; NATURAL ORGANIC-MATTER; RIVER FULVIC-ACID; ELEMENTAL MERCURY; ANOXIC ENVIRONMENTS; ATMOSPHERIC MERCURY; DIVALENT MERCURY; TEMPERATE LAKES; SOLAR-RADIATION; WATER;

D O I：

10.1007/s11356-015-4258-4

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

This study demonstrates that under abiotic dark conditions in aquatic system, humic substances are not only capable of converting Hg(II) to Hg-0 but also able to bind Hg(II) ion. The degree of Hg(II) reduction is significantly influenced by the ratio of -COOH/-OH groups and the sulfur content in the HS, revealing a strong competition between complexation and reduction of Hg(II). This study suggests that abiotic and dark Hg(II) reduction depends on the pH and salinity of aqueous medium. At lower pH (similar to 4.0) and lower salinity (a parts per thousand currency sign5.0 PSU), the reduction of Hg(II) to elemental mercury (Hg-0) was comparatively rapid. Higher -COOH/-OH ratios in HS, favors dark abiotic reduction of Hg(II) as did a lower sulfur (S) content of HS. This study provided a rigorously controlled experimental design that showed that dark abiotic Hg(II) reduction by HS can potentially be important in the aquatic environment and is independent of the photochemical reduction observed in both fresh water and sea water.

引用

页码：10529 / 10538

页数：10

共 49 条

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