Small amounts of Ca‐H‐humic acid suspension in dialysis bags were immersed in dilute CaCl 2 which contained 1.33 × 10 ‐5 M to 6.67 × 10 ‐5 M atratone, atrazine, prometone, or prometryne. Adsorption isotherms were linear. Increases in CaCl 2 concentration from 10 ‐4 M to 10 ‐2 M or larger Ca saturation (10 to 100% Ca) of humic acid resulted in less s ‐triazine adsorption. Greater adsorption occurred when the amount of Ca‐humate at a specified Ca saturation was increased. An ionexchange treatment of adsorption quantitatively predicted adsorption changes with change in s ‐triazine concentration, CaCl 2 concentration, and Ca saturation of the humic acids.
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Gilmour et al. (1971) studied this question.
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