Single-factor and Nemerow Multi-factor index to Assess Heavy Metals Contamination in Soils on Railway Side of Harbin-Suifenhe Railway in Northeastern China

摘要

Heavy metals (Zn, Cu, Pb and Cd) concentrations using atomic absorption spectrometry were investigated in roadside surface (0-20 cm) and sub-surface (20-40 cm) arable soils along Shangzhi section of Harbin-Suifenhe railway, Heilongjiang province, northeastern China. The soil environmental quality on the base of the environmental background value criteria were evaluated respectively by single-factor pollution index (P_i) and Nemerow multi-factor pollution index (P_(ij)) method according to the first grade of Standards for Soil Environmental Quality of China (GB15618-1995). Except for Zn, concentrations of Cu, Pb and Cd in surface soil (0-20cm) were higher than that of sub-surface soil (20-40cm). Concentrations of Zn (106～293 mg kg~(-1)), Cu (17.9～22.4 mg kg~(-1)), Pb (18.2～24.6 mg kg~(-1)) and Cd (64～386 μg kg~(-1)) were lower than the values in China National Standards Grade II. The highest P_i of Zn, Cu, Pb and Cd are 2.93, 0.64, 0.70 and 1.42, respectively. The highest P_(ij) was presented in the 50-m distance soils. The results suggested heavy metals in soils 50-meter distance from railway were higher than that of 10- and 100-meter distance.