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痕量S~(2-)国内外通常采用亚甲基蓝法、分子荧光法、滴定法、电极法及原子吸收分光光度法。本文报导了用冷原子荧光法间接测定痕量S~(2-)的一种新方法,选择了促进Hg~(2+)与S~(2-)定量结合和剩余Hg~(2+)被SnCl_2还原的条件,采用抗坏血酸成功地改变了测定体系的性质,令人满意地建立了工作曲线。该方法所需试剂少,灵敏度高。S~(2-)的检测极限为1.7×10~(-10)克, 变动系数5.5％。该方法的建立扩大了冷原子荧光测汞仪的使用范围。实验部分 (一)仪器与试剂冷原子荧光测汞仪(西安无线电八厂)。 10％SnCl_2 溶液,1％KMnO_4 溶液,3mg/ml抗坏血酸溶液(现配现用),HgCl_2 标准储备液(0.1mg/ml Hg~(2+)),用储备液配制100ppbHg~(2+)工作液,加两滴1％KMnO_4 (现配现用)。
Trace S ~ (2-) methylene blue method commonly used at home and abroad, molecular fluorescence, titration, electrode and atomic absorption spectrophotometry. In this paper, a new method for the indirect determination of trace S ~ (2-) by cold atomic fluorescence spectrometry was reported. It was reported that the quantitative combination of Hg 2+ with S 2- and the remaining Hg 2+ The conditions under which SnCl 2 was reduced, ascorbic acid successfully changed the nature of the assay system, satisfactorily established a working curve. The method requires less reagents and high sensitivity. The detection limit of S ~ (2-) is 1.7 × 10 ~ (-10) g, the variation coefficient is 5.5%. The establishment of this method has expanded the use of cold atomic fluorescence mercury analyzer. Experimental part (a) instruments and reagents cold atomic fluorescence mercury analyzer (Xi’an radio eight plants). 10% SnCl2 solution, 1% KMnO4 solution, 3mg / ml ascorbic acid solution (now with the use of), HgCl2 standard stock solution (0.1mg / ml Hg2 +), the preparation of 100ppbHg2 Liquid, add two drops of 1% KMnO_4 (now with the current use).