Sources, speciation and transformation of arsenic in the gold mining impacted Jiehe River, China
- Cai, YB
- Zhang, H
- Yuan, GD
- Li, FY
DOIAbstract
Mining-contaminated waters may contain high levels of arsenic (As) and iron (Fe), among various metals and metalloids. The complex behavior of As makes its contamination difficult to remediate. This study aimed to determine the sources, possible association of As and Fe with colloids and their speciation and mobility in the Jiehe River, a stream impacted by gold mining. Particulate (>450 nm), colloidal (7 -450 nm), and truely dissolved (<7 nm) forms of As and Fe were determined, and the species of As [As(ill), As(V), monomethylarsonic acid, and dimethylarsinic acid] and Fe [Fe(II) and Fe(IlI)] were both analyzed and modelled using geochemical program Visual MinteQ 3.0. High concentrations of As and Fe were observed in both filtered and part...
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