Soil Environmental Quality Assessment in Changle, Shandong

In Changle County, we collected 315 topsoil samples, analyzed the content of As, Pb, Zn, Cd, Cr, Cu, Hg and Ni eight kinds of heavy metals, using single factor index and Nemerow index to evaluate the soil environmental quality. The evaluation results of single factor soil environmental quality showed that the overall condition of soil environmental quality in Changle County is good; except nickel, seven other heavy metals indicators are clean, i.e. soil area that reached grade I soil environmental quality standards accounted for more than 99.46%. The high-risk nickel content of soil environment is primarily related to geological background. Contaminated areas are concentrated in Neogene basalts distribution areas in central part of Changle County. Its lithology is mainly basalt with interlayer of conglomerate, claystone and diatomite. Nemerow pollution index evaluation shows that the quality of soil environment in Changle County is mainly grade I level of soil environmental quality standards, with ratio of 53.83%. Then grades II and III account for 22.62% and 19.04% of the domain area. Again grades IV and V account for 3.91% and 0.60 % of the domain area. Nickel content is relatively high, which is the most polluted factor affecting the Nemerow index evaluation results. The remaining seven indicators of heavy metals are clean.