【摘要】 <正> 漂兰6B(ECB)是合成铬天青S(CAS)的原料,二者同属三苯基甲烷染料。铬天青S已被广泛用作络合反应中的显色剂,而以漂兰6B作显色剂的络合反应研究得很少。Vekhande等报导了稀土与漂兰6B及溴化十六烷基三甲铵(CTAB)在弱酸性介质中形成三元络合物,但漂兰6B作为四元络合反应的显色剂尚未见报导。在本文中系统地研究了稀土与漂兰6B,更多还原

【Abstract】 The colour reactions of quaternary complexes of rare earth elements with erio-chrome azurol B, 1,10-phenanthroline and cetyltrimethyl ammonium bromide have been studied. The absorption maxima of these quaternary complexes appear at 633-639nm, and their molar absorptivities are 1.72 × 105 - 1.86 × 105Lmol-1cm-1(single wavelength) and 2.02× 105-2.19× 105Lmol-1cm-1 (double wavelength) for Ce - Lu and Y. The composition of the green complex of neodymium is Nd:ECB:phen:CTAB= 1:2:1:6. The apparent stability constants of the quaternary complexes are 2.40 × 1017 - 1.15 × 10l8 from La to Lu. A spectrophotometric method has been developed for the determination of samarium (or europium, gadolinium) in the presence of lanthanum.更多还原