Determination of cyanogen and cyanogen chloride using gas chromatography with a flame ionisation detector |
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| Authors: | P. N. Brown G. G. Jayson M. C. Wilkinson |
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| Affiliation: | (1) Department of Chemistry and Biochemistry, Liverpool Polytechnic, Byrom Street, L3 3AF Liverpool, UK;(2) Chemical Defence Establishment, Porton Down, SP4 0JQ Salisbury, Wiltshire, UK |
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| Abstract: | Summary The response of a flame ionisation detector (FID) to cyanogen ((CN)2) and cyanogen chloride (CNCI) has been studied. The lower limits of detection for (CN)2 and CNCl were 6×10−12 moles and 2×10−11 moles respectively. In a comparative study a thermal conductivity detector gave as its lower limit of detection for both (CN)2 and CNCl 4×10−11 moles. Both detectors showed excellent linearity over the range 0 to 10 micromoles. The ratio of the gradients of the FID calibrations (CN)2/CNCI were found to be approximately two suggesting the response depended on the cyanide group. The response and stability of the FID was investigated as a function of air and hydrogen flow-rates. The response increased with increasing air flow-rate for both (CN)2 and CNCI up to 300cm3min−1, thereafter no significant increase was observed. On raising the hydrogen flow from 10 to 25cm3min−1 only a slight increase in the sensitivity of the FID towards both (CN)2 and CNCI was observed. At higher flow rates the response for (CN)2 increased markedly whereas at the same flow rates the response for CNCI increased only slightly. |
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| Keywords: | Gas chromatography Flame ionisation detection Cyanogen Cyanogen chloride |
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