Abstract：
:Total mercury (HgTOT), inorganic mercury (IHg), and methylmercury (MHg) were determined in dry season waters, sediments, and tailings from an active mine which has long history of gold exploitation. Although HgTOT in waters was generally low (0.03 to 19.60 ng L(-1)), the majority of the samples had proportions of MHg of at least 90 % of HgTOT which denotes a substantial methylation potential of the mine watersheds. Mercury was relatively high in tailing materials (up to 867 μg kg(-1)) and also in the mine sediments (up to 837 μg kg(-1)) especially in samples collected near tailing storage facilities and within a receiving water dam. Sediment profiles revealed mercury enrichment and enhanced methylation rate at deeper layers. The presence of IHg and decaying plants (organic matter) in the watersheds as well as the anoxic conditions of bulk sediments are believed to be some of the key factors favoring the mercury methylation at the site.
journal_name
Environ Monit Assessjournal_title
Environmental monitoring and assessmentauthors
Lusilao-Makiese JG,Tessier E,Amouroux D,Tutu H,Chimuka L,Weiersbye I,Cukrowska EMdoi
10.1007/s10661-015-5059-4subject
Has Abstractpub_date
2016-01-01 00:00:00pages
47issue
1eissn
0167-6369issn
1573-2959pii
10.1007/s10661-015-5059-4journal_volume
188pub_type
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