CONTAMINATION OF SEDIMENTS WITH HEAVY METALS CD, CN, FE, PH IN THE EAST OF ANZALI LAGOON

The surface layer of sediments in the east of the Anzali Lagoon was surveyed for heavy metal contamination during the year 2004 at the National Inland Water Aquaculture Institute. Samples were obtained by sediment sampler (Eckman Grab) from Pirbazar River, Pasikhan and Selkeh. The samples were dried and treated by wet digestion (HNO3, H2SO4, HCLO4) under open reflux condition. Concentration of Pb, Fe, Cu and Cd were 7.92, 0.2775%, 25.8 and 1.645 mg/g dry weight respectively. The Fe and Cu have the highest concentration. We found that in the study area, Pirbazar was the most contaminated with the selected heavy metals.