Influence of pH on Detoxication of Herbicides in Soil

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Abstract
The influence of pH and incubation time on the detoxication of 11 herbicides incorporated into high organic matter soils was investigated. Five of the chemicals were detoxified at different rates at the various pH levels. Optimum pH levels for the detoxication of these chemicals were pH 5.3 for 2-methoxy-3,6-dichlorobenzoic acid (dicamba) and 2,4-dichlorophenoxyacetic acid (2,4-D), 6.5 for 2,2-dichloropropionic acid (dalapon) and 3-amino-1,2,4-triazole (amitrole), and pH 7.5 for S-propyl dipropylthiocar-bamate (vernolate). Slow positive detoxication, without pH influence, was observed for 3-(3,4-dichlorophenyl)-l,l-dimethylurea (diuron) and 3-amino-2,5-dichlorobenzoic acid (amiben). No detectable detoxication was observed for 4-amino-2,5,6-trichloropicolonic acid (picloram), [alpha],[alpha],[alpha]-trifluoro-2,6-dinitro-N,N-dipropyl-p-toluidine (trifluralin), 5-bromo-3-isopropyl-6-methyluracil (isocil), or 2-methoxy-4,6-bis(isopropylamino)-s-triazine (prometone).