Abstract
THE use of Gibbs's reagent1 (2 : 6-dichlor- or 2 : 6-dibrom-p-benzoquinone-4-chlorimine (DBQC)) for locating certain organic thiophosphate pesticides on paper chromatograms was reported by Menn, Erwin and Gordon2. The reagent forms coloured derivatives with a variety of compounds in aqueous alkaline solution, but the development of a red colour in neutral or slightly acid conditions appears to be quite specific for the P→S group, certainly when linked with solubility of the test substance in petroleum solvents. The application of thin-layer chromatography with such a positive identification system offers the possibility of a rapid screening test for these pesticides in toxicological samples.
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References
Gibbs, H. D., J. Biol. Chem., 72, 649 (1927).
Menn, J. J., Erwin, W. R., and Gordon, H. T., J. Agric. Food Chem., 5, 601 (1957).
Fearon, W. R., Biochem. J., 38, 399 (1944).
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BRAITHWAITE, D. Detection of Phosphorothioate Pesticides. Nature 200, 1011 (1963). https://doi.org/10.1038/2001011a0
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DOI: https://doi.org/10.1038/2001011a0
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