부산대학교 도서관

A method for selective detection of mercaptans by use of a silver/sulfide ion-electrode has been developed. Components eluted from a G.C. column are introduced into an absorption tube in which a suitable silver nitrate solution {(1×10-51×10-3)M} flows at a constant flow rate. The solution emerging from the absorption tube is passed into a micro-cell equipped with a silver/sulfide ion-electrode. When mercaptans are dissolved in the absorption solution, the silver ion concentration is lowered by formation of insoluble mercaptide, and changes in the silver ion concentration are detected by the corresponding changes in the ionelectrode potential. The potentiometric output of the ion-electrode is converted by an antilogarithmic converter, and recorded. A chromatogram showing only peaks due to mercaptans is obtained. When it is desired to detect all sulfur compounds, a postcolumn reactor is used where each component undergoes hydrogenolysis, and hydrogen sulfide formed from sulfur compounds is introduced into the absorption solution. Thus a chromatogram recorded peaks of all sulfur compounds is obtained by use of the hydrogenolysis reactor. In this method, sulfur compounds can be easily distinguished from other compounds and mercaptans can be readily identified from other sulfur compounds by comparing both chromatograms.