Photochemical Dissolved Gaseous Mercury (DGM) Formation/Consumption in the Negro River Basin, Brazilian Amazon

被引：3

作者：

da Silva, Gilmar Silverio ^{[1
]}

Jardim, Wilson F. ^{[2
]}

Fadini, Pedro Sergio ^{[3
]}

机构：

[1] Ciencia & Tecnol Maranhao, Dept Quim, Inst Fed Educ, BR-65025000 Sao Luis, MA, Brazil

[2] Univ Estadual Campinas, Inst Quim, BR-13083970 Campinas, SP, Brazil

[3] Univ Fed Sao Carlos, Dept Quim, BR-13565905 Sao Carlos, SP, Brazil

来源：

JOURNAL OF THE BRAZILIAN CHEMICAL SOCIETY | 2009年 / 20卷 / 08期

基金：

巴西圣保罗研究基金会;

关键词：

dissolved gaseous mercury (DGM); dissolved organic carbon (DOC); black water; photolysis; PHOTOINDUCED OXIDATION; ELEMENTAL MERCURY; VOLATILE MERCURY; HUMIC SUBSTANCES; RIO-NEGRO; WATER; AIR; REDUCTION; EXCHANGE; SUNLIGHT;

D O I：

10.1590/S0103-50532009000800023

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Dissolved gaseous mercury (DGM) formation/consumption was measured during several scientific excursions in the Negro River basin, Amazon, Brazil. Measurements were carried out following diel patterns in both white and black water bodies. In white waters, with pH values around 7 and low dissolved organic carbon (DOC) concentration, mercury saturation prevails during the sunlit period, similar to behavior observed elsewhere. This was attributed to DGM generated by a photoinduced mechanism of Hg2+ reduction. On the other hand, in black waters, with pH around 5 and high DOC values (up to 20 mg L-1), DGM concentration stays below the detection limit during sunlit periods, which was associated to photoinduced Hg-0 oxidation. Photochemical experiments carried out ill situ corroborate the influence of sunlight on DGM formation/consumption. A comparison of diel DGM saturation is presented for both black and white water bodies.

引用

页码：1549 / 1555

页数：7

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