Some Response Characteristics of the Electrolytic Conductivity Detector in the Pyrolytic Mode to Chlorine; Nitrogen and Sulphur Compounds

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Abstract
Under pyrolytic conditions at 850°C the electrolytic conductivity (CCD) response of 32 sulphur-containing compounds was examined. For organophosphorus compounds, with the sulphur in a [sbnd]P=S or [sbnd]S[sbnd]P=S configuration, the CCD response is directly proportional to the amount of sulphur present. The effect of other hetero atoms on the sulphur response was also studied. The response contribution of nitrogen depends upon its oxidation state and/or structural configuration within the molecule. In the oxidized form, [sbnd]NO2 in parathion for example, no contribution is observed whereas the thiocarbamate nitrogen reduces the S response. The additive effect of chlorine was found to be proportional to the number of chlorine atoms present. Variable chlorine responses were obtained from nine organochlorine insecticides, with indications that for these compounds the C1 response is structure dependent. Due to a high variation in precision, quantitative organochlorine residue analyses using the CCD in the pyrolytic mode is not recommended.