ABSTRACT
Arsenic (As) in groundwater has variable concentration, which is controlled by the mineralization of crystalline rocks. Consequently, its concentration in the groundwater reaches up to 253 μg/L (Namaqualand), 6150 μg/L (west of Johannesburg), about 500 μg/L in the Karoo aquifers. Acid mine drainage is also found to be important source for As and other toxic metals in the environment.
