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用来作为铌的显色剂颇多,如:对苯二酚、PAR、二甲酚橙、氯代磺酚S等。用酸性铬蓝K(ACBK)显色作铌的光度测定亦早有报导,它具有灵敏度较高,生色稳定、干扰元素少等优点。但ACBK与铌显色时,要求介质不能有较强的氧化剂或还原剂以及大量铁的存在。本文采用盐酸-过氧化氢分解试样,在4N盐酸介质中,以甲基异丁基酮(MIBK)萃取分离大量铁及少量钼、钒等干扰元素后,进行显色测定。
Used as a developer of a lot of niobium, such as: hydroquinone, PAR, xylenol orange, chlorosulfonates S and so on. The spectrophotometric determination of niobium with acid chrome blue K (ACBK) has also been reported for a long time. It has the advantages of high sensitivity, stable coloring and less interference elements. But when ACBK and niobium are colored, it is required that the medium can not have a strong oxidant or reductant and a large amount of iron exists. Hydrochloric acid-hydrogen peroxide decomposition sample was used in this paper. The colorimetric determination was carried out after extracting a large amount of iron and a few molybdenum, vanadium and other interference elements with methyl isobutyl ketone (MIBK) in 4N hydrochloric acid medium.