Fig. 8. Effect of low molecular weight organics on Cd sorption by (a) a variably charged oxisol and (b) a permanently charged alfisol, in the presence of NaNO₃ at ionic strength of 0.03. Concentration of acetate, oxalate, and citrate was 0.5 mmol L^-1, EDTA was 0.01 mmol L^-1.