Quality Evaluation of the Incoming Water to Anzali's Lagoon

Heavy metals in municipal and industrial wastewater can pollute surface water, sediment and soil. In order to evaluate the concentration of heavy metals (Zn, Cd, Pb) in Goharrood sediment and water, a project was designed and to this end, samples of water and sediment were collected. Coordinates of the sample points were determined by GPS (Global Positioning System). Moreover, in the sediment samples, the total amount of Zn, Pb and Cd were determined by atomic absorption spectorophotometer after extraction. The amount of metals, Ph, EC, TDS, SAR were determined in samples of water. Total Pb,Cd and Zn concentration was extracted by 4M HNO3.. Statistical assessments were carried out by SPSS. Results showed that water in all stations were not contaminated by cadmium. Moreover, Zn and Pb contamination were lower than toxic levels. Collected sediment samples were polluted by Pb and Zn but cadmium concentration was insignificant. Maximum concentration of pb (18.20 mg/kg) was observed in the eighth station and minimum concentration of pb (2.10 mg/ kg) in the twenty second station. Furthermore, maximum concentration of Zn (101/64 mg/kg) was observed in the fourteenth station and minimum concentration of Zn (37.80 mg/kg) in the twelfth one. In the last station, maximum concentration of Cd (0 /49 mg/kg) was observed.