Source of Heavy Metals in Sludge of Huoshaogou Wetland Park in Xining

Heavy metals (including As, Cd, Pb, Ti, V, Cr, Mn, Ni, Cu and Zn) concentration analysis for soil samples from Westhill (near Huoshaogou) and source assessment of heavy metals in sludge from Huoshaogou wetland park in Xining city (China) have been carried out. Results show that Cd, Pb, Cr and Zn concentrations in the surface soil are much higher than that in the unpolluted soil from Westhill, and Cr concentration in the sludge from Huoshaogou wetland reaches 12 times and 6 times more than that in the unpolluted and in the surface soils from Westhill, respectively. The results reveal that descent of dust contributed Cd, Pb, Cr and Zn to the wetland, and wastewater mainly contributed Cr to the wetland. In order to protect the environment, human activities and heavy metal discharge should be limited effectively.