期刊
SCIENCE OF THE TOTAL ENVIRONMENT
卷 644, 期 -, 页码 649-660出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.scitotenv.2018.06.366
关键词
Soil toxic metal; Enrichment; Ecotoxicity; Chemical fractions; Double weight system
资金
- Humanities and Social Sciences Foundation of Ministry of Education of China [17YJCZH081]
- Nature Science Foundation of Hubei Province [2018CFB722]
- Soft Science Project Foundation of Hubei Province [2018ADC144]
- National Natural Science Foundation of China [51578222]
An integrated stochastic-fuzzy pollution assessment method (ISFPAM) for soil heavy metal was established based on geo-accumulation index (I-geo), stochastic-fuzzy theory and double weight system under synthetical consideration of metal ecotoxicity and bioaccessibility. The pollution characteristics of the topsoil heavy metals (Cu, Zn, Cd, Pb and Cr) in Xiangjiang New District were evaluated by the widely-used Single factor index (SF), Nemerow index (NI), I-geo, Potential ecological index (PERI), Risk assessment code (RAC) and the ISFPAM. The results of SF, NI, I-geo, RI and RAC of the studied metals revealed the following orders: Cd > Zn > Cr > Cu > Pb, Cd > Zn > Pb > Cr > Cu, Cd > Cr > Cu > Zn > Pb, Cd > Cu > Pb > Cr > Zn, and Cd > Pb > Cr > Zn > Cu, respectively. The different pollution assessment methods outputted the differentiated conclusions to some extent except the judgment for Cd. Results based on ISFPAM indicated that metal pollution degrees decreased in the order of Cd (5.91, Grade 6) > Cu (2.81, Grade 3) > Pb (2.66, Grade 3) > Cr (1.58, Grade 2) > Zn (0.69, Grade 1). By detailed comparison analysis, the double weight system and stochastic-fuzzy theory made ISFPAM better resolving ability to find out priority heavy metals and areas with relatively higher enrichment, ecotoxicity and bioaccessibility under efficient parameter uncertainty control. Cd, Cu and Pb were regarded as the priority control metals, especially Cd. Simultaneously, the reliabilities of heavy metal pollution corresponding to adjacent pollution grades were quite close in some sites, which recommend recheck for avoid misleading the decision-makers. (C) 2018 Elsevier B.V. All rights reserved.
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