pH和有机酸对酸性紫色土吸附-解吸镉的影响  

Effects of pH,Organic Acids on Cadmium Adsorption-Desorption from Acidic Purple Soil

作　　者：周鑫斌[1] 黄建国[1] 赖凡[2] 

机构地区：[1]西南大学资源环境学院,重庆400715 [2]西南大学计算机与信息科学学院,重庆400715

出　　处：《水土保持学报》2007年第6期139-142,共4页Journal of Soil and Water Conservation

基　　金：国家博士后基金(55597);西南大学博士基金(SWUB2006046)

摘　　要：选择酸性紫色土,研究pH和有机酸对紫色土吸附镉的影响。结果表明,pH在1.0～5.0的范围内,Cd^2＋的解吸率从接近100%急剧降低到20.0%。当pH〉5.0,Cd^2＋的解吸率缓慢下降。相对较低的有机酸浓度（≤10^-3mol/L）限制了Cd^2＋解吸,而较高的有机酸浓度则增加了Cd^2＋的解吸。柠檬酸和醋酸在较高浓度（〉10^-3mol/L）时极大地促进了Cd^2＋的解吸,其次是苹果酸,最小的是酒石酸。The desorption characteristics of cadmium in acidic purple soil was studied,and the effects of pH value and organic acid were examined.Desorption of Cd^2＋ decreased sharply from nearly 100.0% to 20.0% within pH 1.0～5.0 in acidic purple soil,and then decrease diminished at pH 〉 5.0.Organic ligands at relatively low concentrations（≤10^-3 mol/L） slightly inhibited Cd^2＋ desorption,but enhanced Cd^2＋ desorption at higher concentrations.Citric acid and acetic acid at higher concentrations（〉10^-3 mol/L） had the greatest improvement of Cd^2＋ desorption,followed by malic acid;and the smallest was tartaric acid.

关 键 词：镉 吸附-解吸 PH 有机酸 酸性紫色土 

分 类 号：X131.3[环境科学与工程—环境科学]