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Appl Environ Microbiol. 1962 May; 10(3): 206-210

The Effect of 2,3,6-Trichlorophenylacetic and 2,2-Dichloropropionic Acids on Nitrite Oxidation¹

Department of Bacteriology and Agricultural Experiment Station, Louisiana State University, Baton Rouge, Louisiana

ABSTRACT

The effects of two herbicides, 2,3,6-trichlorophenylacetic acid, sodium salt, and 2,2-dichloropropionic acid, sodium salt, on nitrite-oxidizing bacteria were studied by the soil perfusion technique. The time of application of 2,3,6-trichlorophenylacetic acid affected its toxicity to the nitrifier. When it was present in the environment as the nitrifier started growth, it was more toxic than if the organisms were allowed to nitrify actively before they were subjected to the herbicide.

The herbicide 2,2-dichloropropionic acid at rates up to 700 ppm had little effect on nitrite oxidation. The toxicity of 2,3,6-trichlorophenylacetic acid for Nitrobacter was reduced by 2,2-dichloropropionic acid irrespective of whether the cells came into contact with the agents before or during active oxidation. The mode of action for this phenomenon has not been determined.

¹ The trade name for 2,3,6-trichlorophenylacetic acid, sodium salt, a product of AMCHEM, Ambler, Pa., is Fenac. The trade name for 2,2-dichloropropionic acid, sodium salt, a product of Dow Chemical Company, Midland, Mich., is Dalapon.