STUDY OF TRACE METALS CONTAMINATION IN THE AGRICULTURAL AREAS OF CHIRANG, A DISTRICT IN ASSAM

Abstract

Groundwater occurs widely and is of good quality for drinking purpose. Since groundwater is directly in contact with soil, rocks, and plants, the constituents of these sources might contaminate the groundwater .For this purpose increasing focus is given to the study of groundwater samples by using AAS method. Chirang is a place of irrigation and agriculture. The groundwater in these areas is found to contain very high amount of Fe. The minimum and maximum Fe concentration was found to be0 .032mg/L and 32.548mg/L respectively. Cu and Co was not found in the studied water samples. Cr content was found in the range 0.003 – 3.080 mg/L; Cd was between 0.004 - 0.025mg/L; Mn concentration 0.001-2.341mg/L and zinc was in the range 0 .056-0.781mg/L. When compared with the WHO limit (2011)it was found that that  Groundwater was strongly polluted by Fe, Cr and Mn, less by Zn , Cd , Ni , Pb .