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铬(Ⅵ)和二苯卡巴肼反应的灵敏度高,选择性较好,已普遍应用于痕量铬的比色测定。因为钒(V)与二苯卡巴肼生成黄色络合物严重干扰铬的测定,所以钒存在时测定微量铬是困难的。在“色层分离-二苯卡巴肼分光光度法测定纯铁、纯铜及钢中微量铬”的一文中,曾详细地研究了铬的色层分离等条件。本文在该工作的基础上,鉴于钒(V)在酸性介质中(pH<1)以VO_2~+离子存在的性质,进一步研究了应用阴离子交换活性氧化铝色层吸附柱(简称吸附柱)从大量的
The reaction of chromium (Ⅵ) and diphenylcarbazide has high sensitivity and good selectivity, and has been widely applied to the colorimetric determination of trace chromium. Because the formation of a yellow complex between vanadium (V) and diphenylcarbazide severely interferes with the determination of chromium, the determination of trace chromium in the presence of vanadium is difficult. In “Chromatographic separation - diphenylcarbazide spectrophotometric determination of trace chromium in pure iron, pure copper and steel”, the conditions for the chromatographic separation of chromium have been studied in detail. On the basis of this work, in view of the existence of vanadium (V) in the acidic medium (pH <1) in the presence of VO_2 ~ + ions, the anion exchange activated alumina chromatography column Lots of