Spatial distribution and risk assessment of heavy metals in contaminated paddy fields - A case study in Xiangtan City, southern China

被引：91

作者：

Deng, Yan ^{[1
,3
]}

Jiang, Luhua ^{[1
,3
]}

Xu, Liangfeng ^{[1
,3
]}

Hao, Xiaodong ^{[1
,3
]}

Zhang, Siyuan ^{[1
,3
]}

Xu, Menglong ^{[1
,3
]}

Zhu, Ping ^{[1
,3
]}

Fu, Shaodong ^{[1
,3
]}

Liang, Yili ^{[1
,3
]}

Yin, Huaqun ^{[1
,3
]}

Liu, Xueduan ^{[1
,3
]}

Bai, Lianyang ^{[2
]}

Jiang, Huidan ^{[2
]}

Liu, Hongwei ^{[1
,3
]}

机构：

[1] Cent S Univ, Sch Minerals Proc & Bioengn, Changsha 410083, Hunan, Peoples R China

[2] Hunan Acad Agr Sci, Hunan Biotechnol Res Inst, Changsha 410125, Hunan, Peoples R China

[3] Minist Educ, Key Lab Biomet, Changsha 410083, Hunan, Peoples R China

来源：

ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY | 2019年 / 171卷

基金：

中国国家自然科学基金;

关键词：

Heavy metals; Spatial distribution; Chemical fractions; Environmental risk assessment; Cancer risk; Paddy soils; SEQUENTIAL EXTRACTION PROCEDURE; HEALTH-RISK; AGRICULTURAL SOILS; SURFACE SEDIMENTS; HUNAN PROVINCE; POLLUTION; CADMIUM; FRACTIONATION; MINE; AREA;

D O I：

10.1016/j.ecoenv.2018.12.060

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

An extensive investigation on spatial distribution and environmental risk assessment based on total content and fractions of heavy metals, as well as the cancer risk of Cd from seven adjacent contaminated paddy fields at Xiangtan City, southern China, was conducted in this study. A total of 63 soil samples were analyzed for soil physical properties and concentrations of eight heavy metals (Cd, Cr, Co, Cu, Mn, Ni, Pb, Zn). The results showed that concentrations of metals except for Cr, Mn and Ni exceeded the background values to varying degrees, and particularly, content of Cd was as 57.4-612 times higher than background values. Principal components analysis and correlation analysis revealed three groups: industry activities for Cd and Zn; natural sources mainly for Cu, Pb, Ni and Cr, with some slight anthropogenic activities for Cu and Pb accumulation; and manganese ore associated with cobalt for Co and Mn. Combined with different indices, Cd and Zn were the major contributors to the ecological risk, and cancer risk of Cd indicated an unacceptable degree in this area. Altogether, results from this study will facilitate a better understanding of metals distribution characteristics and provide a scientific basis for further comprehensive management for these paddy fields. Combination of functional microbial agent and plants promises to be a feasible and effective remediation method for cadmium pollution in the study area.

引用

页码：281 / 289

页数：9

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