Evaluation of heavy metals concentration in Gamasiab river sediments with interpolation model in GIS

Today, one of the most important environmental problems around the world, especially in aquatic ecosystems, is heavy metals pollution. Due that sediments are the main source of heavy metals, in this study, Gamasiab River sediments were evaluated for heavy metal contamination of chromium, copper, nickel, zinc, iron and manganese. After layering, the results were interpolated by two methods of kriging and Inverse Distance. Moller Index, Ecological risk Index and numerical parameters were used to assess the range of sediment pollution. Results of Moller index in spring showed no pollution. Also in summer it indicated no pollution for all metals except Ni. Results of RI categorized level of Heavy metal concentration in low contamination. Using RI plans, zoning plans and Hot Spot analysis indicated that the concentration of heavy metals in east of Gamasiab river in spring is higher than summer and it is showed that spots with high concentration in summer are located in west of Gamasiab river.