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Abstract
The response of the flame ionization detector to CS2 was examined under varying conditions of flow rates of fuel and carrier gases and compared with the responses for CH4, C2H6 and CCI4. The low value of the response for CS2, about 1% of that of CH4, is attributed to preoxidation of CS2 in the flame to substances not contributing to the ion forming process. Carbon disulphide was found to behave like organic compounds with respect to the hydrogen content of the flame, and a similar mechanism involving the formation of CH and its oxidation to CHO+ is proposed for the formation of ions from CS2. Under conditions of flow rates causing the burner jet to become near red hot a thermionic emission effect gives rise to positive response of the same order. The varying reports on the response of CS2 are discussed.
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