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.
出处
《水土保持学报》
CSCD
北大核心
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)
关键词
镉
吸附-解吸
PH
有机酸
酸性紫色土
cadmium
adsorption-desorption
pH
organic acid
acidic purple soil
