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Effects of amendments on the fraction transform of heavy metals in soil contaminated by copper and cadmium |
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Abstract Limestone, calcium magnesium phosphate fertilizer, silicon fertilizer, Chinese milk vetch, and pig manure, respectively, was added into Cu and Cd contaminated acidic paddy soil, then the incubation experiment was conducted to investigate the dynamics of heavy metal fractions after the application of amendments. The results showed that during the 120days, the soil pH was increased with incubation time, and decreased slowly after reaching a peak. Soil pH in treatments with these amendments was all higher than that of the control. However, soil pH was slightly decreased after peat application, as compared with the control. Concentrations of soil water soluble and exchangeable Cu and Cd were significantly decreased with the application of all amendments during the 120d incubation period, and the values decreased gradually to a minimum, then increased again. There were significant negative correlations between soil pH and concentrations of soil water soluble and exchangeable Cu and Cd. Application of amendments increased the concentrations of carbonate-bound, Fe-Mn oxides-bound, organic-bound, residual Cu and Cd by different levels. This implied that all these amendments could transform soil heavy metals from available fractions to potentially available or non-available fractions, and then remedied the heavy metals contaminated soils.
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Received: 24 October 2011
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[1] |
CHEN Huan-Yu, LIU Jing-Qing, WEI Zong-Yuan, ZHANG Hui-Hui, HE Xiao-Fang, ZHOU Xiao-Yan, QIU Shang-De, HU Bao-Lan, LOU Li-Ping. Radial differences in contaminant distribution in large-diameter pipe scales of main pipelines in drinking water distribution system[J]. CHINA ENVIRONMENTAL SCIENCECE, 2015, 35(9): 2706-2712. |
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