Mercury and chromium appears in high concentrations in water and sediments, probably
. caused by two reasons: a natural: concentration
of Hg and Cr in sediments and soils or bearing minerals such as cinnabar and mercuriferous soils for mercury and chromite, pyroxenes and silicates
. for chromium; and b anthropogenic: industrial
activities such as tanneries, textile factories paper mills, building paper and board mills factories, organic chemicals, inorganic chemicals and motor vehicles industries or for leaching of organicmercury pesticides probably used in the agricultural fields around the reservoir