论文部分内容阅读
三溴偶氮胂是我国近年合成的优良的稀土元素总量的显色剂,摩尔吸光系数为ε_(La-Lu)=1.12×10~5—0.75×10~5,我们试验用于测定铁矿中稀土元素总量。结果表明,在0.2—1.0M盐酸介质中稀土元素与显色剂在室温下立即形成组成比为La:R=1:2的络合物,其最大吸收位于630nm,试剂空白的吸光度很小;络合物可稳定24小时。在拟定的试验条件下,铁矿中共存离子量均不干扰测定;稀土元素氧化物量在0—30微克％25毫升范围符合比尔定律。试样分解后,不需加掩蔽剂,分离等步骤即可直接显色。方法简便、快速、准确,重现性好。铁矿标样分析对照,结果满意。
Tribromoarsenazo is an excellent total rare earth element color reagent synthesized in recent years in our country. The molar absorption coefficient is La = 1.12 × 10 ~ 5 ~ 0.75 × 10 ~ 5. The total amount of rare earth elements in the ore. The results showed that the complex with rare earth elements and chromogenic agent in La: R = 1: 2 ratio was formed at room temperature. The maximum absorption was at 630 nm and the absorbance of reagent blank was very small. The complex is stable for 24 hours. Under the proposed test conditions, the amount of coexisting ions in the iron ore does not interfere with the determination; the amount of rare earth oxide in the range of 0-30 micrograms% 25 ml complies with Beer’s law. Sample decomposition, without adding masking agent, separation and other steps can be directly color. The method is simple, fast, accurate and reproducible. Iron ore standard analysis and control, the results are satisfactory.