Sammendrag
Water samples were collected during normal flow (2007) and during a drought period (2008) from five
rivers and tributaries draining the Wanshan Hg mining district, Guizhou, China. Unfiltered methylmercury
(MeHg) as well as particulate and dissolved fractions of MeHg (P-MeHg, D-MeHg) were measured
to assess the spatial and temporal variation of MeHg contamination in the local river system. Most locations
(about 80%) displayed higher MeHg concentrations during drought period than during normal discharge
conditions. Concentrations of MeHg during the drought period ranged from
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