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文献研究了溴邻苯三酚红(BPR)—动物胶光度法测定铌。我们发现在酒石酸—EDTA介质中,在十六烷基三甲基溴化铵(CTAB)存在下,Nb-BPR络合物吸光度灵敏度提高近一倍。为此,我们研究了BPR—CTAB胶束增溶光度法测定铌的可能性。在PH4的乙酸—乙酸铵缓冲液中,铌(V)—BPR—CTAB兰紫色络合物生成,入_(最大)=620毫微米,ε_(620nm)=1.08×10~5。在酒石酸—盐酸介质中以丹宁作载体水解分离铌酸,用EDTA—盐酸洗涤液洗涤沉淀,消除干扰。10—50微克Nb_2O_5/50毫升符合比尔定律。方法用于不含钽钢中微量铌的测定,灵敏度、准确度、稳定性和重现性均较好。
In the literature, bromopyrogallol red (BPR) - animal glue was used to determine the content of niobium. We found that the absorbance sensitivity of Nb-BPR complexes nearly doubled in the presence of cetyltrimethylammonium bromide (CTAB) in tartaric acid-EDTA media. To this end, we investigated the possibility of BPR-CTAB micellar solubilization spectrophotometry for the determination of niobium. The niobium (V) -BPR-CTAB violet complex was formed at pH 4 in acetic acid-ammonium acetate buffer with a maximum of 620 nm and an average of 620 nm of 1.08 × 10 -5. In tartaric acid - hydrochloric acid medium tannin as a carrier hydrolysis niobate separation, washing with EDTA - hydrochloric acid washing sediment to eliminate interference. Beer’s law is obeyed for 10-50 μg Nb 2 O 5/50 ml. The method is suitable for the determination of niobium in tantalum-free steels with good sensitivity, accuracy, stability and reproducibility.