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s-Triazine Adsorption Studies: Ca-H-Humic Acid¹

ABSTRACT

Small amounts of Ca-H-humic acid suspension in dialysis bags were immersed in dilute CaCl₂ which contained 1.33 x 10^-5M to 6.67 x 10^-5M atratone, atrazine, prometone, or prometryne. Adsorption isotherms were linear. Increases in CaCl₂ concentration from 10^-4M to 10^-2M 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, CaCl₂ concentration, and Ca saturation of the humic acids.

¹ This investigation was supported by NIH Training Grant no. ES 0084 from the National Institute of Environmental Health Sciences, Research Triangle Park, N.C.

² Graduate Student and Professor of Soils and Plant Nutrition, respectively, Department of Soil Science and Agricultural Engineering, Univ. of California, Riverside. The senior author is now Assistant Professor of Soil Science, Univ. of Wisconsin, Madison.

Received for publication September 3, 1970. Accepted for publication December 8, 1970.