Metal pollution in soil poses a serious threat to the human health and safety of agricultural products. Evaluation for distribution and remediation of heavy metal pollution is the most concerned. In this paper, 319 information points of heavy metal distribution in a municipal area of about 100 square kilometers are taken into account. A q-q plot made by SPSS, the single-factor model, and the Neremo index model are employed to study impact factors of heavy metals in soil, such as spatial distribution, pollution index, and degree of pollution. Considering the defect caused by equally treating pollution degrees of different heavy metals in the Neremo comprehensive evaluation model, we propose an improved Neremo evaluation model by introducing the weight factor. A comprehensive assessment model on heavy metal pollution in soil has been established and will play a significant role for government to make decisions on environmental protection and agricultural production.
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Hong-gui et al. (2012) studied this question.