江西省典型水稻土对铅的吸附解吸特性研究和环境风险评估  

Adsorption and desorption of lead in typical paddy soils in Jiangxi

作　　者：白玲[1] 常娟[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：《甘肃农业大学学报》2017年第2期13-18,共6页Journal of Gansu Agricultural University

基　　金：江西省普通本科高校中青年教师发展计划访问学者专项资金项目(2014-2016);江西省教育厅科技研究项目(GJJ14289);江西省环境保护科研项目(JXHBKJ2013-4)

摘　　要：【目的】研究江西省典型水稻土对铅的吸附解吸特性.【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铅在水稻土中的吸附-解吸特性,并利用保留因子对铅在水稻土中的环境风险进行评估.【结果】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,各初始浓度下,潜育型水稻土的解吸率为4.88%~28.81%,而潴育型水稻土解吸率为4.90%~20.56%;2种水稻土对铅的吸附用Freundlich方程拟合效果相对较好;铅的环境风险随铅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.【结论】研究表明与潴育型水稻土相比,潜育型水稻土更容易受铅的污染.[Objective] In order to investigate the adsorption and desorption characteristics of lead in typical paddy soils of Jiangxi Province. [Method] Gleyed paddy soil and waterloggogenic paddy soil were collected from Jiangxi Province and the batch equilibrium method was employed to investigate the adsorp- tion and desorption behaviors of lead, and the environmental risk of presence of lead in these soils were as- sessed with retention factors. [Result] The adsorption ability of waterloggogenic paddy soil was significantly higher than that of gley type paddy soil, but the desorption capacity of waterloggogenic paddy soil was less than gley type paddy soil. In various initial concentration, the desorption rate of gley paddy soil was range from 4. 88% to 28. 81%, while the desorption rate of waterloggogenic paddy soil was range from 4. 90% to 20. 56%. The adsorption in two paddy soils could be well described by Freundlich equation. The environmental risk of lead decreased first and then increased with lead concentration, and the gley type pad- dy soil showed better than the waterloggogenic paddy soil. [Conclusion] The gleyed paddy soil is more sus- ceptible to lead pollution when compared with the waterloggogenic paddy soil.

关 键 词：水稻土 铅 吸附 解吸 环境风险评估 

分 类 号：S153[农业科学—土壤学]