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不少资料介绍采用高氯酸作为铬的氧化剂,并研究了氧化铬的各种条件,一般认为高氯酸冒烟的温度、时间明显地影响铬的氧化,如严格控制高氯酸冒烟的条件,可将铬完全氧化,但是也有指出用高氯酸加热冒烟不能将微量铬氧化完全。关于高氯酸冒烟氧化铬的过程及冒烟时分解产物,资料中叙述也不一致。在日常分析工作中经常遇到用高氯酸氧化铬的问题,为此,本文借助于二苯卡巴肼分光光度法研究了高氯酸冒烟氧化铬的过程,并依据有关条件试验的结果,提出了粗浅的看法,共同研究讨论。
A lot of information on the use of perchlorate as a chromium oxidant, and studied the various conditions of chromium oxide, generally believed that the perchloric acid smoke temperature, time significantly affect the oxidation of chromium, such as the strict control of perchloric acid smoke It is possible to completely oxidize chromium, but it is also pointed out that the use of perchloric acid to heat smoke does not completely oxidize trace amounts of chromium. Chromium perchloric acid on the process of smoke and smoke decomposition products, the data described in inconsistent. In the daily analysis of chromium perchlorate often encounter the problem, this paper, by means of diphenylcarbazide spectrophotometry of perchlorate smoked chromium oxide process, and based on the results of the test conditions, Put forward a superficial view of common discussion.