Seasonal distribution and speciation of mercury in a gold mining area, north-west province, South Africa

被引：10
|
作者：
Lusilao-Makiese, J. G. [1 ]
Tessier, E. [2 ]
Amouroux, D. [2 ]
Tutu, H. [1 ]
Chimuka, L. [1 ]
Weiersbye, I. [3 ]
Cukrowska, E. M. [1 ]
机构：
[1] Univ Witwatersrand, Sch Chem, Inst Mol Sci, Johannesburg, South Africa
[2] Univ Pau & Pays Adour, LCABIE, UMR 5254, Pau 09, France
[3] Univ Witwatersrand, Sch Anim Plant & Environm Sci APES, Johannesburg, South Africa
来源：
TOXICOLOGICAL AND ENVIRONMENTAL CHEMISTRY | 2014年 / 96卷 / 03期
基金：
新加坡国家研究基金会;
关键词：
mercury; seasonality; methylation; tailings; gold mining; speciation; INDUCTIVELY-COUPLED PLASMA; MASS-SPECTROMETRY ANALYSIS; SAMPLE PREPARATION; AQUATIC SYSTEMS; METHYL MERCURY; METHYLMERCURY; SEDIMENTS; WATER; BIOAVAILABILITY; ECOSYSTEMS;
D O I：
10.1080/02772248.2014.947987
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
The seasonal speciation of mercury (Hg) was determined in water, soil, and sediments from watersheds located in the North-West province of South Africa. The study area is known to have a long history of mining activities which also include the recovery of gold from old tailings. Both inorganic (IHg) and methyl mercury (MHg) were detected at high concentrations (up to 8480 mu g IHg kg(-1) and 13 mu g MHg kg(-1)) in surface sediments during dry season. A considerable remobilization of Hg from bottom sediments was observed in water from dry to wet season as well as the migration of Hg away from pollution sources due to seasonal influences. Hg in sediments mostly has been speciated as Hg-0. Enhancement of Hg methylation occurred mainly in deeper sediments at regions corresponding to the lowest redox potential, higher pH, and enrichment of IHg. Hg values in borehole waters were very high (up to 3310ng L-1) suggesting a serious contamination of the site groundwater which needs to be addressed urgently in order to minimize further impact that affects the Vaal River and other water systems located nearby.
引用
收藏
页码：387 / 402
页数：16
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