熱イオン化検出器の応答機構の一考察(ノート)

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The thermionic detector(TID) was developed as a sensitive and selective detector for hetero-organic compounds in gas chromatography. The response mechanism of the TID was examined by using four different types of detcctors(Fig. 1).<BR>The effect of hetero-organic compounds on the ionization of alkali metals in the upper flame was investigated by using the detector of Type(A). Ion currents caused by ionization of alkali metals were measured in the presence or absence of a certain hetero-organic compound which was eluted from the chromatographic column. Alkali metals were supplied to the upper flame by evaporating the metal salts loaded on a Pt- wire in the lower flame. Cl-, Br-, I-, and P-containing compounds enhanced the ionization of alkali metals, and P-containing compound had a remarkable effect(Table I).<BR>The effect of hetero-organic compounds on the volatility of sodium chloride coated on a Pt-coil was investigated by using the detectors of Type(B), (C), and (D). The Pt-coil was heated by an electric current, except for Type(D). Enhancement of the volatility was estimated by measuring emission intensity of sodium in the resonance line. Effects of a column effluent, of its combustion products, and of chemical species produced during combustion of it on the volatility were studied by using Type(B), (C), and (D), respectively(Table II). Only N-containing compounds such as amines, nitriles, and nitrocompounds, etc. enhanced the volatility in Type (B). The combustion products of S-, I-, and P- containing compounds enhanced the volatility. Effects of Cl- and Br-containing compounds depended upon the surface temperature of sodium chloride. Effect of S-containing compounds depended upon the chemical species produced during combustion of it. These effects sometimes gave negative responses in TID. The response mechanism for each compound was shown in Table III when the TID's of the single and double flame type were used.
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熱イオン化検出器の応答機構の一考察(ノート)

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