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本文对在非离子表面活性剂Triton X—100存在下的5-Br-PADAP-V(Ⅴ)-H_2O_2分光光度法进行了试验,结果表明非离子表面活性剂在较高酸度下能对该络合物起增溶效应,可提高方法灵敏度,表观摩尔吸光系数为5.5×10~4。据已有报导,5-Br-PADAP法测定钒都在较低酸度显色,对于钴的严重干扰无法消除,资料中采用邻菲绕啉掩蔽钴,但笔者试验效果不好,在岩石中钴、钒的含量往往为同—数量级,不分离钴就无法应用。本法将酸度提高后,可允许100微克钴存在(在25毫升体积中),钛、铁、铜等干扰元素的允许
In this paper, the 5-Br-PADAP-V (Ⅴ) -H 2 O 2 spectrophotometry in the presence of nonionic surfactant Triton X-100 was tested. The results showed that the nonionic surfactant could react with this complex under higher acidity The solubilizing effect of the compound can improve the sensitivity of the method. The apparent molar absorptivity is 5.5 × 10 ~ 4. It has been reported that 5-Br-PADAP method for the determination of vanadium at a lower acidity, a serious interference for the cobalt can not be eliminated, the data used to cover the vicinity of cobalt phenanthroline, but the author test results are not good in the rock cobalt , Vanadium content is often the same - orders of magnitude, can not be applied without separation of cobalt. This method will increase the acidity, allowing the presence of 100 micrograms of cobalt (in 25 ml volume), titanium, iron, copper and other interfering elements allowed