SORPTION OF CADMIUM BY CALCAREOUS SOILS - INFLUENCE OF SOLUTION COMPOSITION

被引:62
作者
OCONNOR, GA
OCONNOR, C
CLINE, GR
机构
[1] New Mexico State Univ, Las Cruces,, NM, USA, New Mexico State Univ, Las Cruces, NM, USA
关键词
CADMIUM COMPOUNDS - Adsorption - SOLUTIONS - Desorption;
D O I
10.2136/sssaj1984.03615995004800060008x
中图分类号
S15 [土壤学];
学科分类号
0903 ; 090301 ;
摘要
Cadmium sorption-desorption by three Ca-saturated, calcareous soils was studied in the presence of various Ca salts. Cadmium retention was extensive in all soil-solution systems and was best characterized by a two-part Freundlich relationship. Part I of the isotherm was interpreted to represent Cd retention by highly Cd-specific adsorption sites, while part II of the isotherm represented a mixture of highly Cd-specific and nonspecific adsorption sites. This interpretation was supported by desorption data. Differences in Cd sorption from various Ca solutions were at least partially rationalized by considering free Cd**2** plus activities as predicted by GEOCHEM. Additional consideration, however, must be given to complementary (competing) ion activities.
引用
收藏
页码:1244 / 1247
页数:4
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