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采用ｐＨ－电位滴定法研究了乙醇溶液中ＲＥ（Ⅲ）与新型荧光试剂Ｈ＿２Ｌ［５－（２＇－羧基苯偶氮）］绕丹宁（ＲＡＣＰ）、５－（４＇－氯代－２＇－羧基苯偶氮）绕丹宁（Ｃｌ－ＲＡＣＰ）、５－（４＇－溴代－２＇－羧基苯偶氮）绕丹宁（Ｂｒ－ＲＡＣＰ）］二元体系，计算了相关平衡常数及在不同ｐＨ条件下各物种之分配比，三种试剂的表现稳定常数大小为ＲＡＣＰ＞Ｃｌ－ＲＡＣＰ＞Ｂｒ－ＲＡＣＰ。而与Ｎｄ（Ⅲ）的累积生成常数ｌｇβｍｌｈ基本相同。同时，研究了浓度对ｌｇβｍｌｈ的影响，测定了１５种稀土与ＲＡＣＰ的ｌｇβｌｈ。发现ｌｇβｍｌｈ随原子序数Ｚ增大变为四组。溶液中各物种分配比的测定表明无ＭＬ＿３生成，其物种分配比随配体与稀土摩尔比的变化而变化，但稀土种类并无影响．
The effects of RE (Ⅲ) and new fluorescent reagent H_2L [5- (2’-carboxy-phenylazo)] rhodanine (RACP), 5- ’-carboxyphenylazo) rhodanine (Cl-RACP) and 5- (4’-bromo-2’-carboxyphenylazo) rhodanine (Br-RACP) The constants and distribution ratios of each species under different pH conditions showed that the stability constants of the three reagents were RACP> Cl-RACP> Br-RACP. And with Nd (Ⅲ) the cumulative formation constant lgβmlh basically the same. At the same time, the influence of concentration on lgβmlh was studied, and the determination of lgβlh of 15 kinds of rare earth and RACP was carried out. It was found that lgβmlh increased with atomic number Z into four groups. The distribution ratio of each species in the solution showed no ML_3 generation. The species distribution ratio changed with the molar ratio of ligand to rare earth, but the species of rare earth had no effect.