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用自制硫化银镀膜电极作指示电极、半胱氨酸—Hg~(2+)络合物作滴定剂,在SAOB溶液(香烟燃烧气体吸收液)中采用电位滴定法测硫离子(有效地阻止了滴定剂对抗坏血酸的氧化作用)电位稳定。终点电位突跃大,不需作滴定曲线就可方便地找到终点,测定下限可达10ppb。测定方法简便、快速、准确、可靠,是对电位滴定测硫法的改进。本文还对抽烟、吸收等条件进行了优选。
Using self-made silver sulfide coated electrode as indicator electrode and cysteine-Hg 2+ complex as titrant, potentiometric titration of sulfide ions in SAOB solution (cigarette combustion gas absorption solution) The titration of ascorbic acid oxidation) potential stability. Sudden jump in the end potential, without titration curve can easily find the end point, the determination of the lower limit of up to 10ppb. The determination method is simple, rapid, accurate and reliable, and it is an improvement on potentiometric titration sulfur method. This article also smoking, absorption and other conditions were optimized.