摘要
采用表面络合模式研究了不同陪伴离子对陕西 4种典型土壤胶体吸附Cu2 +、Pb2 +的影响。结果表明 :在各阴离子体系 ,同一土壤胶体对Cu2 +、Pb2 +吸附百分数达到 5 0 %时对应的pH(pH50 )值呈现 :Cl->SO2 - 4>草酸根 >柠檬酸根 >NO- 3的趋势 ,表面络合常数logKintM 的大小次序与此相反 ;专性吸附特征值 (n值 )反映了吸附过程专性吸附与电性吸附比例的大小 ,其值大小表现为 :NO- 3>Cl- >SO2 - 4>草酸根 >
Summary Effects of accompanying ions on Cu 2+ and Pb 2+ adsorption on soil colloids in Shaanxi were investigated by surface complex model. Results indicated that pH(pH 50 ), when Cu 2+ , Pb 2+ adsorption percentage by tested soil colloids approached to 50%, showed a trend of Cl ->SO 2- 4>oxalic acid>citric acid>NO - 3 in every ion system; that in terms of Cu 2+ , Pb 2+ complex constants (log K int M ) the order was just the other way round; and that specific adsorption characteristic values ( n ), reflecting proportions of specific adsorption and electrostatic adsorption, showed a trend of NO - 3> Cl - > SO 2- 4> oxalic acid> citric acid.
出处
《土壤学报》
CAS
CSCD
北大核心
2003年第2期218-223,共6页
Acta Pedologica Sinica
