An integrated assessment for regional heavy metal contamination in soil based on normal fuzzy number
基于正态模糊数的区域土壤重金属污染综合评价

Due to the uncertainty of assessment of heavy metal contaminations in soils, an integrated approach for evaluation of heavy metals contamination in regional soil based on normal fuzzy number was established. This evaluation method was applied to evaluate the soil contamination of heavy metals in T City of Jiangsu Province. The result showed that most of heavy metals were at clean level except As at slight contamination level. Hg, Cu, Zn were also at slight contamination level in parts of the study area. Enrichment contamination degree of heavy metal was in the order of As>Cu>Hg>Zn>Ni>Cr>Cd>Pb. Although most of heavy metals was at clean level, As, Hg, Cu, Zn were in the edge of contamination level and much attention should be paid on controlling those elements. Compared with the result of triangular fuzzy number method, this method described the membership degree of each heavy metal more precisely and provided more comprehensive and accurate evaluation information.