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Application of nuclear magnetic resonance spectroscopy to the identification and quantitation of pesticide residues in soil
- Krolski, M.E., Bosnak, L.L., Murphy, J.J.
- Journal of agricultural and food chemistry 1992 v.40 no.3 pp. 458-461
- sulprofos, pesticide residues, nuclear magnetic resonance spectroscopy, quantitative analysis, soil pollution
- The application of high-resolution Fourier-transform nuclear magnetic resonance (NMR) spectroscopy to the identification of metabolites of the phosphorodithioate ester pesticide sulprofos (Bolstar) was investigated. While differentiation between the various metabolites using either 1H or 13C NMR was unsuccessful, 31P NMR proved to be an exquisitely sensitive probe for these compounds. Treatment of soil samples with sulprofos at a concentration of 7.4 ppm, followed by incubation for up to 90 days, led to the formation of two major metabolites. The residues were extracted, characterized, and quantitated using 31P NMR. Use of 14C radiolabeled material and analysis of extracts by high-performance liquid chromatography and liquid scintillation counting confirmed the results obtained by 31P NMR.