水资源保护2012，Vol.28Issue(4)：24-27,4.DOI:10.3969/j.issn.1004-6933.2012.04.005
镉在次级河流底泥中吸附-解吸特性及其风险评估
Adsorption-desorption behaviors and risk assessment of cadmium in branch river sediments
摘要
Abstract
The adsorption-desorption behaviors of Cd2+ in branch river sediments were studied using the adsorption-desorption test, and the transport characteristics and environmental risk of Cd2 + were assessed. The results show that the adsorption capacity of the sediments for Cd + increased, while the adsorption rate decreased, with the increase of the equilibrium concentration of Cd + . The maximum adsorption capacity was 1 655.575 μg/g when the equilibrium concentration was 23.09 μg/mL. The adsorbing process had two stages: the fast adsorption that occurred in the first 30 minutes, and slow adsorption that occurred after 60 minutes. The desorption capacity of the sediments for Cd2 + increased with the increase of the adsorption capacity, and the desorption rate ranged from 1.51% to 4.96% . The retention factor was sensitive to the equilibrium concentration of Cd2+ , and it decreased with the increase of the equilibrium concentration. The practical distribution coefficient (Kd) and retention factor (R') of Cd2+ in the Daxi River were 1766.15 L/kg and 99968.76 L/kg, respectively, indicating a low transport risk of Cd2+ .关键词
Cd/底泥/吸附-解吸/保留因子/风险评估Key words
cadmium/sediment/adsorption-desorption/retention factor/risk assessment分类
资源环境引用本文复制引用
雷蕾,陈玉成,杨志敏,李雪玲..镉在次级河流底泥中吸附-解吸特性及其风险评估[J].水资源保护,2012,28(4):24-27,4.基金项目
国家水体污染控制与治理重大科技专项(2008ZX07104-002-07B) （2008ZX07104-002-07B）
