Evaluation of Pb, Zn and Cd focusing on IPI, PI and Igeo in Sediments of Hashilan Wetland, Iran

Investigation of heavy metals in the bed sediments of wetlands can be used as an appropriate index for determining environmental quality of wetlands. In this study, the concentration of lead (Pb), zinc (Zn) and cadmium (Cd) in sediments of 8 points in the Hashilan wetland was evaluated. Geo-accumulation index (I-geo), input potential index (IPI) and pollution index (PI) calculated for bed sediments of the wetland. The I-geo for Cd, Pb and Zn were obtained as -2.29 to -2.68, -0.86 to -1.15 and -1.77 to -2.12. The PIs for mentioned heavy metals were 0.1-0.3, 0.07-0.14 and 0.007-0.01; and the IPI were 0.19, 0.1 and 0.009, respectively. Based on the results, the concentration of heavy metals in this wetland is lower than international standards, and this wetland is classified as clean and pollution-free regions.