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在氢溴酸溶液中,加抗坏血酸还原游离溴后,用TBP萃取黄色溴化碲络合物,使碲与其他干扰元素分离,而直接比色测定碲.实验结果表明黄色络合物在TBP甲苯溶液中最大吸收在450毫微米,溶液颜色稳定,并符合Beer定律.用20%TBP甲苯溶液萃取即能使萃取液消光度达最高值.溴化钠可代替部分氢溴酸.萃取率和分配系数分别为95.6%和21.7. 微量铁、毫克量铜、强氧化剂和强还原剂干扰,而其他包括常与碲在矿石中共生的硒、金、银、汞、铊等元素及一些常见的酸及盐类均无显著影响.
In hydrobromic acid solution, ascorbic acid was added to reduce the free bromine, TBP was used to extract the yellow tellurium bromide complex to separate tellurium from other interfering elements, and the direct colorimetric determination of tellurium.The experimental results showed that the yellow complex in TBP toluene The maximum absorption in the solution is 450 nm and the color of the solution is stable and consistent with Beer’s Law. Extraction with 20% TBP in toluene yields the highest extinction of the extract. Sodium bromide replaces part of the hydrobromic acid. Coefficients were 95.6% and 21.7 respectively. Trace amounts of iron, milligram quantities of copper, strong oxidizers and strong reducing agents interfered, while others included elements such as selenium, gold, silver, mercury and thallium, which are often symbiotic with tellurium in ores and some common acids And salt had no significant effect.