Optimisation of the Sulphur Phosphorus Emission Detector and Comparison with the Electrolytic Conductivity Detector to some Sulphur-containing Insecticides and Herbicides

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Abstract
The flame parameters of the sulphur phosphorus emission detector (SPED) were examined for maximum response to a thiocarbamate, a phosphate and a phosphorothioate, under a given set of gas chromatographic conditions. An oxygen be was preferred for the sulphur compound, with an oxygen/hydrogen ratio of 0.2-0.25 and a low hydrogen flow of 100-150 ml/min, whereas for the phosphorus compounds an air flame gave the best response with an oxygen/hydrogen ratio of 0.1-0.15 and a higher hydrogen flow of 200 ml/min. The response of the SPED was similar to that of other flame photometric detection in that it gave a linear response in the phosphorus mode, a squared relationship in the sulphur mode for sulphur compounds and a quadratic response for compounds that contained