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合成了新显色剂二溴羧基偶氮胂,研究了其与稀土离子的显色反应。在盐酸、磷酸、高氯酸、硫酸介质中试剂与铈组稀土形成稳定的配合物。最大吸收在632nm 处。铈配合物的摩尔吸光率为1.40×10~5l·mol~(-1)·cm~(-1),高于已常用的变色酸双偶氮胂、膦类试剂。
A new chromogenic reagent dibromocarboxyarsenazo was synthesized and its color reaction with rare earth ions was studied. In hydrochloric acid, phosphoric acid, perchloric acid, sulfuric acid medium reagents and rare earth cerium group to form a stable complex. The maximum absorption at 632nm. The molar absorptivity of cerium complex is 1.40 × 10 ~ 5l · mol ~ (-1) · cm ~ (-1), which is higher than the commonly used chromogenic acid bisazoarsine and phosphine reagent.