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痕量锑的测定通常采用三苯甲烷类和罗丹明类(如孔雀绿、结晶紫、亮绿、罗丹明B等)显色剂的萃取光度法,这些方法耗用较多有机试剂,且操作繁琐。近年来,荧光酮类胶束增溶吸光光度法测定锑显示出高的灵敏度。邻硝基苯基荧光酮(o-NPF)在各种表面活性剂存在下,对Nb、Ge、Sn、Mo、Ti、Cu等金属离子均具有较高灵敏度。目前,这类显色剂用于测定锑的报道还不多。本文探讨了在表面活性剂(CTMAB)存在下,用显色剂o-NPF测定锑的方法。该法可在较高酸度条件下(0.02～0.07M H_2SO_4)测定。ε_(521)=6.06×10~4,Sb量在0～25μg/25ml范围内符合比耳定律。方法选择性较好,灵敏度也较高,操作简便迅速。
Determination of trace amounts of antimony usually uses the extraction photometry of triphenylmethane and rhodamine (such as malachite green, crystal violet, bright green, rhodamine B, etc.), these methods consume more organic reagents, and the operation Tedious. In recent years, fluorinated ketones micellar solubilization spectrophotometric determination of antimony showed high sensitivity. O-nitrophenylfluorone (o-NPF) in the presence of various surfactants, for Nb, Ge, Sn, Mo, Ti, Cu and other metal ions have a higher sensitivity. At present, there are not many reports on the use of these color reagents for the determination of antimony. This article explores the use of the reagent o-NPF in the presence of surfactant (CTMAB) to determine antimony. The method can be measured under higher acidity (0.02 ~ 0.07M H_2SO_4). ε 521 = 6.06 × 10 4, the Beer’s law is obeyed in the range of 0 ~ 25 μg / 25ml. The method has good selectivity, high sensitivity and easy operation.