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武汉大学首次合成的显色剂——3-(4-羧基苯偶氮)-6-(4-乙酰基苯偶氮)-4,5-二羟基-2,7-萘二磺酸,简称对乙酰基偶氮羧-p,已用于稀土元素的光度分析,尚未见到有关用于钍测定的报道。本文拟介绍该显色剂与钍显色反应的最佳条件。在0.1N盐酸介质中,生成蓝色络合物,络合物可稳定12小时。在25ml体积中,1～18μgThO_2符合比尔定律,并由此计算出摩尔吸光系数,e_(710)=2.8×10~5。方法简便、快速,是目前测定微量钍的高灵敏方法。可用于岩矿样品的分析,结果满意。
Wuhan University for the first time the synthesis of the developer - 3- (4-carboxyphenylazo) -6- (4-acetylphenylazo) -4,5-dihydroxy -2,7-naphthalene disulfonic acid, referred to as Acetyl azo carboxy-p, has been used for the spectrophotometric analysis of rare earth elements, has not yet seen the report for the determination of thorium. This article intends to introduce the color reagent and thorium color reaction conditions. In 0.1N hydrochloric acid medium, a blue complex was formed and the complex was stable for 12 hours. In 25ml volume, 1 ~ 18μgThO_2 accorded with Beer’s law and the molar extinction coefficient was calculated, e_ (710) = 2.8 × 10 ~ 5. The method is simple and rapid, which is a highly sensitive method for the determination of trace thorium. Can be used for rock and mine samples analysis, the results are satisfactory.