ガス電極検出器による硫黄化合物の選択的検出

概要

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A simple, sensitive, and selective gas sensing probe for gas chromatography, using a gas electrode detector, is described. This probe is constructed from a commercially available sulfide ion-selective electrode. Compounds eluted from a GC column are passed through a silica tube (650×0.5 mm i. d.) packed with platinum wires. The tube is heated at 950℃ under a hydrogen atmosphere. By this treatment, sulfur compounds can be converted to hydrogen sulfide and hydrocarbon compounds, to methane. The gas resulted is led to the thin stream of a solution containing NaOH which flows (0.04 ml/min) at the crystal menbrance surface of the sulfide electrode. Whereupon the hydrogen sulfide is trapped by the NaOH solution. Slow stream of the solution results in a satisfactory enrichement effect of the hydrogen sulfide. The detection limit is 3×10^<-13> g/s for dimethyl disulfide. The probe was used for the analysis of naphtha and gasoline. Only 2 μl of gasoline was enough to detect sulfur compounds.
社団法人日本分析化学会の論文
1986-01-05