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建立了对苯二胺-Fe(Ⅲ)体系荧光分光光度法快速有效测定水样中痕量H_2S的新方法。在酸性体系中,对苯二胺与FeCl_3及H_2S反应产生有荧光的劳氏紫,用荧光分光光度法进行测定。其激发波长和发射波长分别为590 nm和620 nm,1.3~65μmol/L,相关系数r=0.9982,检出限为0.122μmol/L,回收率为97.7%~113.2%。方法适用于水样中痕量H_2S含量的测定。
A new method for the rapid and effective determination of trace H_2S in water samples by fluorescence spectrophotometry with p-phenylenediamine-Fe (Ⅲ) system was established. In the acidic system, p-phenylenediamine reacted with FeCl 3 and H 2 S to produce a fluorescent lousy violet, which was determined by fluorescence spectrophotometry. Its excitation and emission wavelengths were 590 nm and 620 nm, 1.3 ~ 65 μmol / L, respectively. The correlation coefficient was 0.9982. The detection limit was 0.122 μmol / L. The recoveries ranged from 97.7% to 113.2%. The method is suitable for the determination of trace H 2 S in water samples.