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The Effects of Temperature and Soil Water on Conversion of DDT to DDE in Soil

1976; Wiley; Volume: 5; Issue: 3 Linguagem: Inglês

10.2134/jeq1976.00472425000500030005x

1537-2537

W. D. Guenzi, W. E. Beard,

Groundwater flow and contamination studies

Abstract A laboratory study was conducted to determine the rates of DDT (1,1,1‐trichloro‐2,2‐bis [ p ‐chlorophenyl] ethane) degradation and DDE (1,1‐dichloro‐2,2‐bis [ p ‐chlorophenyl] ethylene) formation in soil. Degradation rates increased with higher temperatures and in the presence of water. Of the DDT mixed with Raber silty clay loam, 82.1, 74.5, 53.2, and 38.3% was recovered as DDT and 6.7, 12.5, 21.6, and 34.8% as DDE after 140 days incubation at 30, 40, 50, and 60C, respectively. A comparison of DDE formation in sterile and nonsterile soil showed that 84% of the conversion was due to a chemical process at 30C and 91% at 60C. In sterile systems at 30C, rates of DDE formation were similar in submerged soil and soil at 1/3 bar suction, and both were much higher than in air‐dried soil.