Hydrochemical, mineralogical and isotopic investigation of arsenic distribution and mobilization in the Guandu wetland of Taiwan.

Highlights: [•] Distribution and mobilization of As in the Guandu wetland were investigated. [•] As mobility occurred in the boundary between the Fe-reducing and sulfate-reducing conditions. [•] High aqueous As was caused by the reductive dissolution of solid Fe compounds. [•] Enriched and values implies significant dissimilatory sulfate reduction. [•] Arsenic mobility in wetland ecosystem is controlled by redox cycling of Fe, S and C. [ABSTRACT FROM AUTHOR]