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对马尿酸偶氮氯膦是武汉大学最近合成的稀土新显色剂,其结构式为: 我们对该试剂与稀土元素显色反应条件和用于测定钢铁中稀土总量进行了研究。该试剂在0.02～0.5N各种酸介质中,均能与稀土元素立即反应生成兰色稳定络合物。络合物的最大吸收波长位于680nm左右。各稀土元素(La～Lu、Y)的络合物的摩尔吸光系数为(7.27～10.22)×10~4·1·mol~(-1)。cm~(-1)。该试剂的主要特点在于它与稀土元素反应具有显色酸度高、灵敏度较高。选择性和稳定性较好,允许共存元素量也较高。控制适当条件,它与铈和钇所形成的络合物的吸光度是一致的。所以它是一种目前测定稀土总量较为理想的试剂。即使有较大量EDTA、酒石酸以
On the hippuramine acid chlorophosphonazo is Wuhan University recently synthesized rare earth color reagent, the formula is: We have the reagents and rare earth elements color reaction conditions and for the determination of total rare earths in steel were studied. The reagent in 0.02 ~ 0.5N various acid medium, can react with the rare earth elements to produce blue stable complex. The maximum absorption wavelength of the complex is about 680nm. The molar absorptivity of the complex of rare earth elements (La ~ Lu, Y) was (7.27 ~ 10.22) × 10 ~ 4 · 1 · mol ~ (-1). cm ~ (-1). The main feature of this reagent is that it reacts with rare earth elements with high color and acidity and high sensitivity. Selectivity and stability are good, allowing a higher amount of coexisting elements. Under appropriate conditions, it is consistent with the absorbance of the complexes formed by cerium and yttrium. So it is a kind of ideal reagent for measuring the total amount of rare earth. Even with a larger amount of EDTA, tartaric acid is present