江西省典型水稻土对铜、铅吸附解吸特性研究(英文)

[目的]研究江西省典型水稻土对铜、铅的吸附解吸特性。[方法]以江西省2种典型的水稻土(潜育型、潴育型)为试材,采用振荡平衡法研究铜、铅在水稻土中的单一和竞争吸附-解吸情况,并利用吸附分配系数对铜和铅在水稻土中的环境风险进行评估。[结果]等比例条件下两种水稻土对铜和铅离子的吸附量为铅大于铜,且潴育型水稻土的吸附能力明显大于潜育型,但两种水稻土对铜和铅离子的解吸量则为铜大于铅,且解吸能力为潜育型水稻土大于潴育型;与单一体系相比,竞争条件下水稻土对铜和铅离子的吸附量均明显降低,但解吸率则明显升高;水稻土中铜污染的潜在环境风险大于铅,铜和铅离子的环境风险随p H升高而减小,且铜和铅共存时明显增大。[结论]研究表明在铜和铅离子共存于水稻土时,与铅污染相比,应重视和尽量避免铜的污染。

Research of Adsorption and Desorption Characteristics of Cu and Pb in Typical Paddy Soils in Jiangxi Province

[Objective] This study was conducted to investigate the adsorption and desorption characteristics of Cu and Pb in typical paddy soils in Jiangxi Province.[Method] Two kinds of typical paddy soils (Gley type,Waterloggogenic type) in Jiangxi Province were chosen as test materials.The single and competitive adsorption behaviors of Cu and Pb in paddy soils were investigated with batch equilibrium method,and the environmental risk under coexistence of Cu and Pb in these soils was estimated with distribution coefficient.The results showed that under equal proportion,the adsorption affinity of Pb was greater than that of Cu in the two paddy soils,and the adsorption capacities in waterloggogenic paddy soil (WPS) were significantly higher than those in gley paddy soil (GTPS),but the desorption capacities of Cu were greater than those of Pb in the two paddy soils,and the desorption capacities in GTPS were significantly higher than those in the WPS.The adsorption capacities of Cu and Pb ions under competitive condition were obviously lower than those in single system,while the desorption rates significantly increased.The potential environmental risk of Cu pollution was greater than that of Pb in paddy soils,and their environmental risk decreased with the increase of pH,but increased significantly under coexistence of lead and copper.[Conclusion] This research suggests that when Cu and Pb ions coexist in the paddy soils,compared with lead pollution,we should pay attention to the pollution of Cu.