ATRAZINE HYDROLYSIS IN SOILS: CATALYSIS BY THE ACIDIC FUNCTIONAL GROUPS OF FULVIC ACID

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Abstract
The catalysis of atrazine hydrolysis at 25.0.degree.C by the types of acidic functional groups found in humic materials has been investigated. No evidence of catalysis by carboxylate ions was observed. From a knowledge of the types and numbers of acid functional groups in a quantitatively characterized fulvic acid, and the distributions of their KA values it was found that hydrogen ions and undissociated carboxyl groups were the only catalytic agents. The carboxyl groups have a second-order kAH of 7.88 days-1 M-1. Weakly acidic functional groups having Ka .simeq. 10-10 showed no catalysis. A predictive equation has been produced for the half-life of atrazine in fulvic acid solutions at 25.0.degree. C. It represents a general class of equations which should permit the practical prediction of atrazine persistence in soil solutions and other natural waters.

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