過塩素酸銀を用いる硫化水素の光電光度定量用テープの開発

概要

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A porous cellulose tape coated with silica gel as the absorbent and impregnated with a processing solution that includes silver perchlorate, p-toluenesulfonic acid, glycerin and methanol is a highly sensitive means of detecting hydrogen sulfide and is stable upon exposure to light. Hydrogen sulfide, absorbed on the surface of the tape, reacted with silver perchlorate to form a stain (silver sulfide), the intensity of which could be measured quantitatively by an optical system to determine the concentration of hydrogen sulfide.A linear relation was obtained between sampling time and relative intensity in the range of 5〜50 ppb of hydrogen sulfide at a constant flow rate of sampling gas. The detection limit (signal-to-noise ratio=3) was 2 ppb for hydrogen sulfide with a sampling time of 5 min and flow rate of 350 ml/min. The sensitivity of this tape was 2.5 times as high as that previously reported. This method is not greatly affected by other gases except for hydride gases such as phosphine.
社団法人日本分析化学会の論文
1994-08-05