measurement of heavy metals (pb+2, cd+2 and ni+2) in real samples of anzali wetland by atomic absorption spectrometry technique

Abstract: for environmental protection, public health, and pollution control, we must have precise information about the extent of pollutants, especially, heavy metals in water environments. having high stability, heavy metals can produce danger in living organisms. therefore, the present research was conducted to assess the concentration of heavy metals and compare the findings with national and international standards. in this study, the concentration of metals (pb2+, cd2+ and ni2+) in water, surface sediments and tissue of a species of aquatic plants (serratophyllum) in anzali wetland was determined. in this study, four areas of anzali wetland were selected for sampling. sediment and texture samples of the studied plants after drying and pulverization by wet digestion and acid mixing method (hclo4, hno3 and h2so4) using a multi-house heater chemical digestion of the samples took place [1,2]. extraction and separation of the studied heavy cations in the aqueous samples were performed using organic solvent (mibk) and complexing agent (apdc) [3]. the average accumulation of lead, cadmium and nickel in surface sediments was 3.74, 1.49 and 8.29 μg/g dry weight, respectively. the highest accumulation of heavy metals in the aquatic plant tissue of serratophyllum belonged to nickel metal at 17.34 μg/g and the lowest concentration belonging to cadmium metal was 0.309 μg/g dry weight. the maximum concentrations of nickel and lead in water were 141 and 89 μg/l, respectively, at the east wetland area. in this study, the concentrations of metals obtained in water, sediment and plant tissue samples were compared with noaa, isqg, who and epa standards .the results showed that the concentration of studied metals at the east wetland area was higher than other areas due to the entry of industrial wastewater.