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二苯碳酰二肼与铬生成红紫色络合物,已广泛应用于各种矿物、岩石、钢铁及合金中微量铬的测定,但铁、钒干扰较大,虽能以碱熔后分离与放置后比色,但给方法带来某些局限。铬的萃取分离研究较早的是用甲基异丁酮在低于10℃下进行,但萃取操作不便。高分子胺应用于萃取分离铬,对消除某些干扰离子取得较好效果。本文在0.1-1M硫酸介质中,以高分子胺N235萃取铬(Ⅵ),有机相以二苯碳酰二肼在乙醇均相溶液中直接显色。矿石经过氧化钠碱熔后水浸,以锇盐或甲醛催化破坏过氧化氢,然后酸化后萃取光度测定,应用在几种不同类型矿石中铬的测定,结果良好。
Diphenylcarbazide and chromium generated purple complex, has been widely used in various minerals, rocks, steel and alloy determination of trace chromium, but iron, vanadium interference, although the alkali fusion after melting and separation Color after placement but gives some limitations to the method. Chromium extraction and separation studies earlier with methyl isobutyl ketone at less than 10 ℃, but the extraction operation inconvenience. Polyamine used in extraction and separation of chromium, to eliminate some of the interference ions to obtain better results. In this paper, chromium (Ⅵ) was extracted with polymer amine N235 in 0.1-1M sulfuric acid medium, and the organic phase was directly developed with diphenylcarbazide in ethanol homogeneous solution. The ores are flooded after soda ash fusion, catalyzed by osmium salt or formaldehyde, which destroys hydrogen peroxide and then acidified for extraction spectrophotometry, which is used in the determination of chromium in several different types of ores with good results.