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1引言用硫氰酸盐、8-羟基喹啉、2，6-二氯-4-溴偶氮胂等作显色剂测定微量铀的方法灵敏度较低，选择性较差，很难满足测定复杂矿样中微量铀的需要。实验表明，在硝酸介质中，2－（3-羧基苯偶氮）-7-（4-氯-2-磷酸基苯偶氮）－1，8－二羟基-3，6-萘二磺酸（CPA-mK）可与铀（Ⅵ）
1 Introduction Thiocyanate, 8-hydroxyquinoline, 2,6-dichloro-4-bromo-arsenazo, etc. as a reagent determination of trace uranium is less sensitive, less selective, it is difficult to meet the determination The need for trace uranium in complex ore samples. Experiments have shown that 2- (3-carboxyphenylazo) -7- (4-chloro-2-phosphaphenylazo) -1,8-dihydroxy-3,6-naphthalenedisulfonic acid (CPA-mK) with uranium (Ⅵ)