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金属铬中铁的测定方法已报导的有络合滴定法、电位滴定法和分光光度法等。在这些方法中由于铬和其他共存元素干扰,都需分别采用挥发除铬、萃取、沉淀或离子交换等方法进行分离后才能测定,因此上述方法都较繁琐、费时。本文研究了原子吸收分光光度法测定金属铬中铁的条件。在对铁的干扰试验中,较现有文献增多了元素种类及加大了共存量的影响试验,探讨了某些干扰原因。建立的方法比较简便、快速、不需要分离,试样经盐酸分解后即可测定。方法精确度好,标准偏差为
Determination of chromium metal chromium has been reported by complexometric titration, potentiometric titration and spectrophotometry. Due to the interference of chromium and other coexisting elements in these methods, it is required to separate them by the methods of volatile chromium removal, extraction, precipitation or ion exchange, respectively. Therefore, the above methods are both cumbersome and time-consuming. In this paper, the conditions for the determination of iron in metallic chromium by atomic absorption spectrophotometry were studied. In the iron interference test, compared with the existing literature increased the types of elements and increase the impact of coexistence test, to explore some of the causes of interference. The established method is relatively simple, fast, without separation, the sample can be determined after hydrochloric acid decomposition. Method accuracy is good, the standard deviation is