Soil pH and Metallic Amendment Effects on DDT Conversion to DDE1
- Ralph G. Nash2,
- William G. Harris2 and
- Cornelius C. Lewis3
Highs oil pH resulted in greater conversion of 1,1,1-trichloro-2,2-bis(p-chlorophenyl)ethane (DDT) to 1,1-dichloro-2,2-bis(p-chlorophenyl)ethylene (DDE) in both nonamended and MgO-amended soils. The conversion of DDT continued throughout the experimental time of up to 32 months to a maximum of 15% of total residues as DDE. DDT was converted to DDE in both moist and dry soils above pH 7. The predominant conversion mechanism in moist soils appears to be microbial, whereas chemical conversion appears to be dominant in dry soils. Soils amended with MgO required pH values of near 10 before DDT conversion became significant. CaCO3, a dolomitic lime, Fe2O3, or Al2O3 applied to soils with a wide range of pH values did not enhance DDT conversion to DDE. Laboratory experiments indicate that the liming of soils containing DDT is not a practical means of converting DDT to DDE.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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