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Published in Soil Sci Soc Am J 36:58-64 (1972)
© 1972 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Adsorption of Ametryne and Atrazine on an Oxisol, Montmorillonite, and Charcoal in Relation to pH and Solubility Effects1

V. K. Yamane and R. E. Green2

ABSTRACT

Adsorption of ametryne exceeded that of atrazine on soil and montmorillonite at both low and high pH. Ametryne (pKa {cong} 4.0) showed a greater increase in adsorption with decrease in pH than atrazine (pKa = 1.68). Addition of charcoal to soil masked the effect of soil pH on ametryne adsorption. Adsorption of ametryne on charcoal decreased at the low pH values conducive to ametryne protonation, demonstrating the effect of pH on triazine-water affinity in the absence of specific triazine-adsorbent interactions which are responsive to triazine protonation. Adsorption isotherms were adjusted by use of "relative solution concentrations" to examine the influence of pH and temperature on the relative affinities of water and adsorbent for triazine herbicides. A wetting agent used in the commercial ametryne product had no effect on the adsorption of ametryne.

NOTES

1 Journal Series no. 1273 of the Hawaii Agr. Exp. Sta. Part of a thesis submitted by the senior author in partial fulfillment of a graduate program in soil science for the M. S. degree. This work was done as part of the Hawaii contribution to Western Regional Research Committee W-82.

2 Formerly Research Assistant, and Associate Professor of Soil Science, respectively, Dep. of Agronomy and Soil Science, Univ. of Hawaii, Honolulu. 96822

Received for publication May 20, 1971. Accepted for publication September 1, 1971.






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