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本文研究了三溴偶氮胂与锆显色反应的条件和性质,发现在1.21NHCl介质中,生成稳定的蓝紫络合物,λ_(m( ?))=630nm,ε_(630)=4.60×10~4,方法准确度高,选择性、稳定性好,在水相显色,简便、快速,用于岩石矿物中微量锆的测定,得到令人满意的结果。 1.主要试剂及仪器: 氧化锆标准溶液:1ml含10μgZrO_2(0.1NHCl溶液)。三溴偶氮胂〔简称TBA〕:0.1％水溶液(武汉大学合成)。 721-2型分光光度计。 2.试验方法:取10μg ZrO_2于25ml比色管中,加入6NHCl 2ml,(试剂空白补加0.1NHCl 1ml),加显色剂1ml,用水稀至10ml,摇匀,显色10分钟后,加水定容,摇匀。
In this paper, the conditions and properties of the chromogenic reaction of tribromoarsenazo with zirconium were studied. It was found that the stable blue-violet complex was formed in 1.21N HCl medium with λ_ (m) = 630 nm and ε_ (630) = 4.60 × 10 ~ 4. The method has the advantages of high accuracy, selectivity, good stability, color development in the water phase, simple and rapid determination of trace zirconium in rock minerals and satisfactory results. 1. The main reagents and equipment: Zirconia standard solution: 1ml containing 10μgZrO_2 (0.1NHCl solution). Tribromoarsenazo [abbreviation: TBA]: 0.1% aqueous solution (Wuhan University synthesis). 721-2 spectrophotometer. 2. Test Methods: Take 10μg ZrO_2 in 25ml colorimetric tube, add 6NHCl 2ml, (reagent blank plus 0.1NHCl 1ml), add color reagent 1ml, diluted with water to 10ml, shake, color 10 minutes, add water Set the volume, shake well.