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连二亚硫酸锌是生产连二亚硫酸钠(保险粉)的中间产物,其中含有少量硫代硫酸锌、亚硫酸锌、硫化锌等。Kilrog提出用甲醛加成后以碘量法测定znS_2O_4含量,但需进行二次测定,即先测定ZnS_2O_4与ZnS_2O_3总量再测出ZnS_2O_3量。其后他又提出在高纯氩气饱和的情况下,用亚甲基蓝作氧化剂测定了Na_2S_2O_4、Na_2SO_5、NaS_2O_5、NaS_2O_5混合物中Na_2S_2O_4含量,S_2O_3~(2-)、SO_3~(2-)、S~(2-)不干扰。本文以高纯氮(99.99%)代替高纯氩,用亚甲基蓝测定了中间产品ZnS_2O_4,并试验了S_2O_3~(2-)、SO_3~(2-)、S~(2-)对测定的影响,获得满意结果。
Even with zinc dithionite production of sodium dithionite (insurance powder) of the intermediate product, which contains a small amount of zinc thiosulfate, zinc sulfite, zinc sulfide and so on. Kilrog proposed the determination of the content of znS_2O_4 by the iodometric method after the addition of formaldehyde, but the secondary determination is needed, that is, the total amount of ZnS_2O_4 and ZnS_2O_3 is measured before the amount of ZnS_2O_3 is measured. He later proposed that the content of Na_2S_2O_4, S_2O_3 ~ (2 -), SO_3 ~ (2 -), S ~ (-) in mixtures of Na_2S_2O_4, Na_2SO_5, NaS_2O_5 and NaS_2O_5 with methylene blue as oxidant in the saturated argon gas was measured. 2-) Do not disturb. In this paper, the high purity argon (99.99%) was used instead of high purity argon, and the intermediate product ZnS_2O_4 was determined by methylene blue. The effect of S_2O_3 ~ (2 -), SO_3 ~ (2-) Get satisfactory results.