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一铁的快速测定重铬酸盐-氯化亚锡-氯化高汞测定铁的方法,显著的铂、金、钼、钨、铜、砷、钒及锑皆有干扰,其中以钒的干扰最大。文献提出含钒高于0.6%必须预先强硷分离。Ottaway提出关于钒干扰的论文,通过电位滴定及分光光度研究指出:V(V)被Sn(Ⅱ)还原生成部份V(Ⅲ),因其不能为Hg(Ⅱ)氧化,乃是发生干扰的原因所在。其证实V(Ⅳ)根本不与铬(Ⅵ)反应。我们在该文基础上,参考文献“V(Ⅱ)及V(Ⅲ)的测定”一节拟定了无需分离钒,以定量Fe(Ⅱ)基准液预先将钒还原成四份消除干扰的快速测定铁的方法。
Rapid determination of iron by dichromate-stannous chloride-chlorination method for the determination of iron by high mercury, notably platinum, gold, molybdenum, tungsten, copper, arsenic, vanadium and antimony all interfere with vanadium interference maximum. Literature suggests that vanadium above 0.6% must be strongly alkaline before separation. Ottaway’s paper on vanadium interference shows that V (V) is partially reduced to Sn (II) to form part of V (III) by potentiometric titration and spectrophotometry, because it can not be oxidized by Hg (II) The reason is. It was confirmed that V (IV) did not react with chromium (VI) at all. On the basis of this article, we reference the section “Determination of V (II) and V (III)” to develop a method for reducing vanadium to four interference-free Method for rapid determination of iron.