Research on heavy metal of surface sediment and runoff of Lingang New City in Shanghai

Abstract:

Particle distribution and heavy metal concentration in surface sediment and surface runoff of different functional areas including traffic area (TA), commerial area (CA) and cultural and educational area(C&EA) of Lingang New City in Shanghai were analyzed in the present study. Heavy metal loads of surface sediment and annual loads of surface runoff were calculated based on sample analysis. The results indicated that particle size distribution curves are similar in different functional areas, and particles less than 300 μm account for 65%-85%. Concentrations of Cu, Pb and Cr in surface sediment of traffic area are higher than those in the other two areas, however, the concentrations of Hg and As were higher in the latter two areas. The concentration of Cd in different areas was comparable. As for surface runoff, the heavy metal concentrations of grab samples step across a wide range and heavy metal concentrations in surface runoff from C&EA were the highest. Heavy metal loads of surface sediment and annual loads of surface runoff in C&EA were higher than those of the other two areas. The loads of surface sediment of Cu, Cd, Pb, Cr, Hg and As in C&EA were 2.03, 0.205, 2.42, 2.82, 0.0171 and 1.63 mg/m²,respectively. The loads of surface runoff of Cu, Cd, Pb, Cr, Hg and As in C&EA were 37.21,1.10,19.46,9.60,0.83 and 7.22 g/(hm²/a), respectively.