Abstract：[Background] The quality of reclaimed land restricts the value and use models of land. Ecological risk assessment is an important basis for the control and prevention of heavy metal contamination. The object of this paper is to study the content characteristics and potential ecological contamination risk of 6 heavy metals elements in farming soil of Xiaoyi bauxite reclaimed land, which have reclaimed for 10 years in 3 terrains of plain, gentle slopeland, and steep slopeland.[Methods] The soil samples in 0-20 and >20-40 cm layers from plain, gentle slopeland, and steep slopeland were collected. The contents of 6 heavy mental (As, Cd, Cr, Cu, Ni, and Pb) in both 0-20 and >20-40 cm of soil layers were measured using ICP-AES after acid digestion, and further the contents and distribution characteristics were analyzed. Finally, the contamination degrees and potential ecological risks of heavy metals were assessed using Hakanson potential ecological risk index. The data of heavy metal contents were mean values of three repetitions, and the calculation and analysis were conducted using software Excel 2010 and SPSS 13.0.[Results] 1) The concentrations of Cd and Pb presented that plain > gentle slopeland > steep slopeland in both of 0-20 cm and >20-40 cm layers, while the other 4 metals sbowed no certain change pattern in 0-20 cm. 2) At 3 different terrains and 2 soil layers, the degree of contamination ranged in 13.18-14.92, with an average 13.88, which was at medium contamination level. The potential ecological risk index ranged in 239.05-275.57, and average was 255.35, which were at a medium risk level. At 0-20 cm soil layer, the degree of contamination and potential ecological risk demonstrated as plain > gentle slopeland > steep slopeland, and as steep slopeland > plain > gentle slopeland in >20-40 cm soil layer. The Cd was the major contamination element and Pb was the second, while Cd at a high and Pb at a medium contamination level. The other 4 elements did not show contaminations and at a low potential ecological risk.[Conclusions] The contamination degree of heavy metals is higher in plain and gentle slopeland than in steep slopeland. As more human impact on plain land and gentle slopeland while steep slopeland is at a nature state, the slope effect on the heavy metal concentrations, contamination degree and potential ecological risk, and the influence gradually decreases with the reduction of slope.
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WANG Xiong. Characteristics and potential ecological risk assessment of heavy metals in reclaimed land of a bauxite mine. SSWC, 2019, 17(2): 94-102.
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2019, Vol. 17 
