%0 Journal Article %T Kinetic Characteristics of Cd2+ Desorption in Minerals and Soils under Simulated Acid Rain
模拟酸雨条件下Cd2+在土壤及其矿物表面的解吸动力学特征 %A WANG Dai-chang %A JIANG Xin %A BIAN Yong-rong %A GAO Hong-jian %A JIAO Wen-tao %A
王代长 %A 蒋新 %A 卞永荣 %A 郜红建 %A 焦文涛 %J 环境科学 %D 2004 %I %X The kinetic characteristics of Cd2+ desorption in minerals and soils under simulated acid rain were studied by using the flow-stirred method. It showed that Cd2+ desorption could be described by first-order kinetics. Percents of desorption amounts of Cd2+ calculated were 70%-100% in red soil and goethite, and 25%-50% in latosols and kaolinite. Parabolic diffusion could describe Cd2+ desorption kinetics in latosols and not suitable for red soil and goethite and kaolinite. Cd2+ desorption, regarded as a heterogeneous diffusion in minerals and soils, could be fitted by Elovich equation more than Parabolic diffusion and two-constant equation. Cd2+ desorption could be divided into fast reaction and slow reaction. Except for latosols, fast reaction would be over during 60 min and be close to quasi-equilibrium. Adsorption forms of Cd2+ in soil surface could be exchangeable and specific. Fast reaction was relative to easily desorbed Cd2+. The affinity of edge hydroxyl to Cd2+ would lead to the difference of Cd2+ desorption rate and amounts. Increase of pH value in effluent indicated H+ consumption in the processes of Cd2+ desorption. %K Cd2+ ion %K desorption kinetics %K soils %K minerals %K soil acidification
镉离子 %K 解吸动力学 %K 土壤 %K 矿物 %K 土壤酸化 %U http://www.alljournals.cn/get_abstract_url.aspx?pcid=3FF3ABA7486768130C3FF830376F43B398E0C97F0FF2DD53&cid=A7CA601309F5FED03C078BCE383971DC&jid=64CD0AA99DD39F69401C615B85F123EF&aid=A5E794165C28872F&yid=D0E58B75BFD8E51C&vid=C5154311167311FE&iid=E158A972A605785F&sid=7555FB9CC973F695&eid=B62E0EEFE746E568&journal_id=0250-3301&journal_name=环境科学&referenced_num=11&reference_num=25