江西省典型水稻土对镉的吸附解吸特性研究

Studies on the Adsorption and Desorption of Cadmium in Typical Paddy Soil in Jiangxi Province

以江西省2种典型水稻土(潜育型、潴育型)为试材,采用振荡平衡法研究了镉在水稻土中的吸附-解吸行为,并利用保留因子对镉在水稻土中的环境风险进行了评估。结果表明:潴育型水稻土的吸附能力较强,明显大于潜育型水稻土,但潴育型水稻土的解吸能力小于潜育型水稻土;2种水稻土对镉的吸附均可用Freundlich方程较好的拟合;镉的环境风险随镉含量的升高先减小后增大,且潜育型水稻土大于潴育型水稻土,但镉在2种水稻土中潜在环境风险均较大。

Two kinds of typical paddy soil （Gley type, Water loggogenic） in Jiangxi Province were chosen as the test material. The adsorption - desorption behavior of cadmium in paddy soils was investigated with batch equilibrium method, and the environmental risk of the presence of cadmium in these soils was assessed with retention factors. The results showed that the adsorption ability of Water loggogenic paddy soil （WPS） was significantly higher than that of Gley type paddy soil （GTPS）, but the desorption capacity of the former was less than that of the latter. The adsorption characteristics in two paddy soils could be well described by Freundlich equation. The environmental risk of cadmium decreased first and then increased with increased cadmium concentration. The environmental risk of GTPS was larger than that of WPS. While the potential environmental risk of cadmium was relatively high in two paddy soils.