The availability and mobility of arsenic and antimony in an acid sulfate soil pasture system.

The Macleay floodplain on the north coast of New South Wales, Australia, has surface soil concentrations of up to 40 mg kg(-1) arsenic (As) and antimony (Sb), due to historical mining practices in the upper catchment. The floodplain also contains areas of active and potential acid sulfate soils (ASS). Some of these areas are purposely re-flooded to halt oxidation processes, but the effect of this management on the metalloid mobility and phytoavailability of the metalloids present is unknown.