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Transformation of Propanil-Derived 3,4-Dichloroaniline in Soil to 3,3',4,4'-Tetrachloroazobenzene as Related to Soil Peroxidase Activity¹

ABSTRACT

Contrary to reports in the literature, no correlation was found between the peroxidase activity of five soils or the numbers of peroxidase-producing microorganisms and the abilities of the soils to condense 3,4-dichloroaniline (DCA) derived from the hydrolysis of N-(3,4-dichlorophenyl) propionamide (propanil) to 3,3',4,4'-tetrachloroazobenzene (TCAB). Amending the soils with an energy source increased the production of peroxidase extractable from the soil but decreased the amount of TCAB formed. It has been reported that a peroxidase-producing fungus isolated from soil was capable of converting DCA to TCAB. However, peroxidase isolated directly from a soil of this study was incapable of converting DCA to TCAB. Apparently not all soil peroxidases catalyze the conversion.

¹ Contribution from the USDA-ARS, IAEQ, Biological Waste Management Lab., Beltsville, Maryland 20705.

² Soil Scientist, US Soils Laboratory.

Received for publication June 23, 1972. Accepted for publication December 19, 1972.