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本文研究了稀土-甲基百里酚蓝(MTB)-溴化十六烷基吡啶(CPB)三元络合物的显色反应。测定了15个稀土元素的三元络合物的吸收光谱及摩尔吸光系数。选择了适宜的显色条件。并加入掩蔽剂Zn-EDTA,提出了既可测定稀土总量又可测定铈组分量的分析方法。合成试样测定结果的变动系数小于5％。实验方法:吸取10~(-4)M稀土标准溶液2.00毫升于25毫升容量瓶中,加10~(-3)M的MTB溶液2.5毫升,2×10~(-3)M的CPB溶液2.5毫升(测铈组分量加0.002MZn-EDTA2毫升),用1:10氨水调至呈绿色,再用1:50的盐酸溶液调至恰变黄色。加pH
In this paper, the color reaction of rare earth-methyl thymol blue (MTB) -bromide bromide (CPB) ternary complex was studied. The absorption spectra and molar absorptivities of ternary complexes of 15 rare earth elements were determined. Choose the appropriate color conditions. And adding masking agent Zn-EDTA, proposed the determination of both rare earth and cerium components of the analytical method. The coefficient of variation of the results of the synthetic samples is less than 5%. Experimental Method: Pipette 2.00 ml of 10-4M rare earth standard solution in a 25 ml volumetric flask, add 2.5 ml of 10-3 M solution of MTB, 2.5x2.3 M solution of CPB 2.5 Ml (measured amount of cerium component plus 0.002MZn-EDTA 2 ml), adjusted to 1:10 aqueous ammonia to green, then 1:50 hydrochloric acid solution to just change to yellow. Add pH