Adsorption and Desorption Characteristics of Cadmium and Lead in Typical Paddy Soils of Jiangxi Province and Its Environmental Risk Assessment  

江西省典型水稻土对镉、铅吸附解吸特性和环境风险评估（英文）

作　　者：常娟[1] 白玲[1] 冷婧[1] 汪小强[1] 

机构地区：[1]江西农业大学理学院,江西南昌330045

出　　处：《Agricultural Science & Technology》2016年第7期1621-1626,共6页农业科学与技术（英文版）

基　　金：Supported by Science and Technology Research Project of Jiangxi Education Department(GJJ14289);Science and Technology Research Project of Environmental Protection Department of Jiangxi Province(JXHBKJ2013-4);Special Fund for Visiting Scholars from the Development Program for Middle-aged and Young Teachers in Colleges of Jiangxi Province(GJGH[2014]N0.15)

摘　　要：[Objective] This study aimed to investigate the adsorption and desorption characteristics of cadmium and lead in typical paddy soils of Jiangxi Province. [Method] Gleyed paddy soil and waterloggogenic paddy soil were collected from Jiangxi Province and used as experimental materials to investigate single and com- petitive adsorption and desorption behaviors of cadmium and lead by batch equilib- rium method. The environmental risk of the presence of cadmium and lead in paddy soils was assessed using distribution coefficients. [Result] Under equal ratio condi- tions, the adsorption capacity of lead by two types of paddy soils was higher than that of cadmium, and the adsorption rate in waterloggogenic paddy soil was higher than that in gleyed paddy soil. The desorption capacity of cadmium by two types of paddy soils was higher than that of lead, and the desorption rate in gleyed paddy soil was higher than that in waterloggogenic paddy soil. Under competitive condi- tions, the adsorption capacity of cadmium and lead by paddy soils was significantly reduced compared with single ion system, while the desorption rate was remarkably improved. The potential environmental risk of cadmium contamination was greater than that of lead in paddy soils. Moreover, environmental risks of cadmium and lead were reduced with the increase of pH, which increased significantly under the coex- istence state. [Conclusion] In the coexistence of cadmium and lead, cadmium con- tamination should be controlled and avoided compared with lead contamination in paddy soils.[目的]研究江西省典型水稻土对镉、铅的吸附解吸特性。[方法]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镉、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镉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镉和铅离子的吸附量为铅大于镉,且潴育型水稻土的吸附能力明显大于潜育型,但两种水稻土对镉和铅离子的解吸量则为镉大于铅,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镉和铅离子的吸附量均明显降低,但解吸率则明显升高;水稻土中镉污染的潜在环境风险大于铅,镉和铅离子的环境风险随p H升高而减小,且镉和铅共存时明显增大。[结论]研究表明在镉和铅离子共存于水稻土时,与铅污染相比,应重视和尽量避免镉的污染。

关 键 词：Paddy soil Cadmium and lead Competitive adsorption and desorption Environmental risk assessment 

分 类 号：X53[环境科学与工程—环境工程] X825