对硝基偶氮氯膦(2-(4-氯-2-膦酸基苯偶氮)-7-(4-硝基苯偶氮)-1,8-二羟基-3,6萘二磺酸)结构式为: 1979年首先报导把它用于铈组稀土的光度测定。随后发现该试剂在酸性介质中与钇有一特征的β反应,可在一定量铈组稀土存在下测定钇,是一种很有价值的稀土显色剂。为了进一步研究该试剂与稀土络合反应的机理。我们首先对该试剂在水溶液中的离解作 P-Nitrophenylazonophosphine (2- (4-chloro-2-phosphonophenylazo) -7- (4-nitrophenylazo) -1,8-dihydroxy-3,6-dinaphthyl disulfonate Acid) Structure: First reported in 1979, it was used for cerium rare earth luminosity determination. It was subsequently found that this reagent has a characteristic β reaction with yttrium in an acidic medium and that yttrium can be measured in the presence of a certain amount of rare earth cerium, which is a valuable rare earth developer. In order to further study the reagent complexed with rare earth reaction mechanism. We first make dissociation of this reagent in aqueous solution