The accumulation of arsenic from arsenic-rich natural waters by aquatic weeds.
Arsenic accumulations in the range 30 to 650 mg/kg dry wt. were detected in several submerged species taken from the Waikato river system where the element occurred from geothermic sources. Emergent species contained little arsenic. Accumulation was influenced by the amount of arsenic in the water but not by the amount in the river of lake bottoms. The withdrawal of arsenic from the river water by aquatic weeds did not appear to markedly affect the discharge of arsenic into the sea.