偶氮胂Ⅲ学名1,8-二羟基萘-3,6-二磺酸-2,7-双[(偶氮-2)-苯胂酸],能同多种元素形成非常稳定的有色内络合物,由于它有反应在酸性溶液中进行、灵敏度很高、阴离子干扰很小的特点,已开始应用于Th、U、Pa、Zr、Hf、Sc、希土元素等的比色测定。一、偶氮胂Ⅲ的性质偶氮胂Ⅲ不同于库兹涅佐夫早先提出的胂酸偶氮衍生物。在它的分子中含有两个官能团-分析基。 Arsenazo Ⅲ scientific name 1,8-dihydroxynaphthalene-3,6-disulfonic acid -2,7-bis [(azo-2) -phenyl arsonic acid], with a variety of elements to form a very stable colored Complexes, due to its reaction in acidic solution, high sensitivity and small anion interference, have been applied to the colorimetric determination of Th, U, Pa, Zr, Hf, Sc and rare earth elements. I. Properties of arsenazo III Arsenazo III is different from the arslazo azo derivatives previously proposed by Kuznetsov. In its molecule contains two functional groups - analysis.