Abstract
A procedure is described for the clean-up process used in this Laboratory prior to the analysis of foodstuffs for the presence of traces of nitrosamines. Recoveries from this procedure were estimated by the gas chromatographic separation of the individual nitrosamines and subsequent detection by a Coulson electrolytic conductivity detector. The ability of the detector to give a reproducible response has been assessed, as was the retention stability of the GLC system. A similar study on a combined gas chromatographic-mass spectrometric system used for the confirmation of the presence of nitrosamines is also described. The value of the Coulson detector for screening purposes prior to mass spectrometric confirmation was assessed using samples of cheese, fish, meat and some other commodities.
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