
TY  - JOUR
A1  - Tiller, KG 
A1  - Nayyar, VK 
A1  - Clayton, PM 
T1  - Specific and non-specific sorption of cadmium by soil clays as influenced by zinc and calcium
JF  - Soil Research
JO  - Soil Res.
Y1  - 1979
VL  - 17
IS  - 1
SP  - 17
EP  - 28
KW  - 
UR  - https://doi.org/10.1071/SR9790017 
N2  - The sorption of low concentrations of cadmium by the calcium-saturated <2 µm fraction of four soils was studied in the presence of variable concentrations of calcium and zinc, as a model of reactions in contaminated soils. The sorbed cadmium and zinc was determined by radioisotopic procedures and partitioned experimentally into specifically and non-specifically sorbed forms. With cadmium the non-specifically sorbed form usually exceeded specifically sorbed. Specific sorption of cadmium was depressed by competition with zinc but not the reverse. The non-specifically sorbed component of sorbed cadmium, as defined by rapid exchange with calcium nitrate solution, was preferred over calcium by the clay exchanger, with separation factors of 4-10 for cadmium saturations of <1% CEC. Some implications for the management of soil as a sink for heavy metal pollutants are discussed. 
ER  -

