Evaluation of contamination and origintion of heavy metals in sediments, water and stem of Kiaklayeh wetland using qualitative indicators of sediment

This study was conducted to evaluate the concentrations of heavy metals including: copper, cobalt, chromium, cadmium and arsenic in sediments, water, roots of Phragmites in three areas of Kiaklayeh wetland that are affected by Mehr housing, agricultural and municipal wastewater. In order to measure heavy metals, ICP-OES was used. Qualitative indicators were also used to examine these pollutants more closely. The results showed that the accumulation of cobalt in the sediments which receivied agricultural and housing effluents is higher than the area of the wetland that is affected by the municipal landfill, but the concentration of chromium and cadmium in the sediments near the landfill is higher than the other two areas of the wetland. Is. Also, in the sediments under agricultural effluent, the amount of copper and arsenic was higher than the other two regions. Accumulation of cobalt and copper in the roots of Phragmites in the area affected by Mehr housing wastewater is higher than the agricultural area, but the amount of copper in the stem of Phragmites growing in the agricultural grounds is higher. EF higher than 1 was obtained for cadmium and cobalt in the area contaminated with Mehr housing effluent. The highest Igeo was related to cadmium and the highest anthropogenic contribution was obtained as well as the highest RI and MERMQ for the studied metals in the wastewater from agricultural area. The highest amount of PLI was obtained for the area contaminated with Mehr housing wastewater. together, it can be said that agronomic wastewater have the highest potential for ecological and biological hazards and also Mehr effluent has the the biggest amount of pollution for the wetland ecosystem. Arsenic agricultural wastewater and also arsenic and copper in Mehr housing wastewater, respectively , showed the highest TF to the roots of reeds.