首页|SPATIAL DISTRIBUTION AND ECOLOGICAL RISK ASSESSMENT OF HEAVY METALS IN SOILS AROUND INDUSTRIAL NON-POINT SOURCE

SPATIAL DISTRIBUTION AND ECOLOGICAL RISK ASSESSMENT OF HEAVY METALS IN SOILS AROUND INDUSTRIAL NON-POINT SOURCE

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The main objective of this study was to evaluate the spatial distribution and ecological risk of the heavy metals in soils around the industrial non-point source in the western town of Yixing city, an area with intensive industrialization in Yangtze River Delta of China. Investigated were the elements of Cd, Cr, Cu and Pb in topsoil with different distances in all the four directions from the industrial town (east, west, south, and north direction, respectively). Results show that Cd, Cr, Cu and Pb element are slightly accumulated, appreciably higher than the background values. The heavy metals concentrations in the west direction evidently exceed in the other three directions. The mainly reason is due to the subtropical monsoon climate and a large amount of discharged waste situated in the west of industrial town. This study also finds that almost all heavy metals show low correlation with the distance in the westward direction but significantly correlation with the increasing distance in the east direction. It is because of a combined effect of heavy metals in soils around non-point source. However, compared with point source, a decreasing trend with increasing distance due to non-point source is not evident, but the polluted territorial scope is wider. By means of correlation analysis, trace metals source in different directions is different around the industrial non-point source. Pb and Cu contaminants are the mainly polluted source in all four directions, especially in the western and eastern direction. Moreover, there are many industrial Cr contaminants in the northward direction and Cd contaminant at the south side of the industrial town is one of mainly contamination sources. The ecological risk assessment results show that all the soil heavy metals around non-point source are at low or moderate risk by the use of catastrophe progression method. Due to the combined effect of soil heavy metals, the ecological risk indices do not evidently change with the increasing distance in all the four directions. It is concluded that the ecological risk due to non-point source is wider than that due to point source.

soil heavy metalsspatial distributionecological risk assessmentindustrial non-point source

Cao, Wei、Zhou, Shenglu、Wu, Shaohua、Wang, Guoliang

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Chinese Acad Sci, Cold & Arid Reg Environm & Engn Res Inst, State Key Lab Frozen Soil Engn, Lanzhou 730000, Gansu, Peoples R China|Chongqing Land Resources & Housing Surveying & Pl, Chongqing 400020, Peoples R China|Nanjing Univ, Sch Geog & Oceanog Sci, Nanjing 210093, Jiangsu, Peoples R China

Nanjing Univ, Sch Geog & Oceanog Sci, Nanjing 210093, Jiangsu, Peoples R China

Northwest A&F Univ, Coll Resources & Environm, Yangling 712100, Shanxi, Peoples R China

2015

Fresenius environmental bulletin: FEB

Fresenius environmental bulletin: FEB

ISTP
ISSN：1018-4619
年,卷(期)：2015.24(12App.)