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碘量法测锡过程中,用亚铁抑制溶解氧的影响已有20多年的历史。在这20多年间,国内的分析工作者对其反应过程曾作了不少工作,积累了许多可贵的经验及数据。但以往的工作只局限于铁(Ⅱ)离子与氧的关系上,故未曾找到抑制溶解氧的主要问题。所以有人沿用了“负催化”反应的术语,也有人提出了[FeO_2]~(2-)离子的假设。但这些术语和假设过于抽象,本法在反复试验的过程中找到了比铁(Ⅱ)氯络阴离子更稳定的铁(Ⅱ)氯碘络阴离子[FeCl_3I]~(3-)。
Iodometric measurement of tin in the process, with dissolved oxygen inhibition of ferrous has more than 20 years of history. In these 20 years, domestic analysts have done a lot of work on their response process and accumulated many valuable experiences and data. However, the previous work was limited to the relationship between iron (II) ions and oxygen, so no major problem of inhibiting dissolved oxygen was found. Therefore, some people follow the term of “negative catalysis” reaction, and some people put forward the hypothesis of [FeO_2] ~ (2-) ions. However, these terms and assumptions are too abstract. In the course of trial and error, this method found a more stable iron (II) chloride iodide anion [FeCl3I] ~ (3-) than iron (II) chloride.