| Abstract: | The effect of temperature and ultraviolet (uv) radiation on the persistence of methyl parathion and DDT in soils was studied using controlled environmental conditions. The uv radiation employed was that which would be biologically effective (300-400 nanometers). The three alkaline soil types used in the study were Houston Black clay, Pima silty clay, and Pinal gravelly loam. The soils were placed in petri dishes and treated with a mixture of methyl parathion and DDT at 5, 20, or 1000 ppm. The 5 and 20 ppm treatments were used to quantitate the amount of pesticide remaining in the soils at periodic intervals. Quantitation was carried out using gas-liquid chromatography (GLC). The 1000 ppm treatment was used for qualitative studies which included GLC, thin-layer chromatography (TLC), and mass spectrometry. In addition to these experiments, standard samples of pesticides were irradiated with uv radiation for qualitative studies. ... |
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