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Chemical and Thermal Aspects of Pesticide Disposal¹

ABSTRACT

Pesticides, when treated with sodium biphenyl reagent, were decomposedto the extent of 80 to 99%. However, when these compoundswere treated with a mixture of metallic sodium and liquidammonia, 15 of the 19 compounds were completely degraded.When metallic lithium was substituted for metallic sodium, the mixturewas less effective but still completely degraded 8 of 19 compounds.The decomposition products resulting from these reactionswere not tested for toxicity.

The pesticide formulations were incinerated, either singly ormixed, at 900C. Analyses of the volatile products revealed thatat least four hazardous gases (chlorine, hydrogen chloride, hydrogensulfide, and nitric acid) were produced.

¹ Paper presented Dec. 28–29, 1970, in Chicago, Ill., at theAmerican Association for the Advancement of Science. Section"O" Agriculture Symposium on "Agriculture and the Quality ofthe Environment in the Seventies."

² Associate Professor of Biochemistry; Professor of Soil Microbiology;and Associate Professor of Agricultural and BiologicalEngineering, respectively, Mississippi State Univ., State College,Miss. 39762.

This study was supported by Agricultural Research Service,USDA, Grant no. 12-14-100-9182(34), administered by the PlantSci. Res. Div., Beltsville, Md. Mississippi Agr. & Forestry Exp.Sta., Publication no. 2122.