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本文对草酸盐和铁对钼的极谱测定的干扰和消除干扰的方法进行了研究。提出了用HNO_3-HClO_4破坏草酸盐和消除铁干扰的方法。在本操作条件下,破坏草酸盐操作简便、快速,且允许测定液中铁含量高达1毫克(Fe/Mo=10~3倍)仍不干扰钼的测定,免去了分离铁等干扰元素的手续,且破坏草酸盐和消除铁干扰一道操作完成,这不但简化了操作手续,加快了分析速度,而且从试液燕干,破坏草酸盐到极谱测定都在同一烧杯中进行,试液不经任何转移,分取,定容等操作手续,这样又免使操作中可能造成的污染和引起钼的损失。从而又提高了分析结果的精密度和准确度。
In this paper, oxalic acid and iron on the molybdenum polarographic determination of the interference and elimination of interference methods were studied. A method of destroying oxalate and eliminating iron interference with HNO 3 -HClO 4 was proposed. Under this operating condition, the destruction of oxalate is simple, fast and allows the determination of up to 1 mg of Fe in the solution (Fe / Mo = 10 to 3 times) without interfering with the determination of molybdenum, eliminating the need to separate interfering elements such as iron Procedures, and the destruction of oxalate and eliminate interference with iron to complete an operation, which not only simplifies the operation, speed up the analysis speed, and from the test Yan Yan, destroying oxalate to polarographic determination in the same beaker, the test Liquid without any transfer, sub-access, volume and other procedures, so as to avoid the pollution caused by the operation and cause the loss of molybdenum. This in turn improves the precision and accuracy of the analysis results.