ВЛИЯНИЕ ПАВ РАЗЛИЧНОЙ ПРИРОДЫ НА СПЕКТРОФОТОМЕТРИЧЕСКИЕ ХАРАКТЕРИСТИКИ КОМПЛЕКСА СКАНДИЯ С КСИЛЕНОЛОВЫМ ОРАНЖЕВЫМ

Abstract

At various pH values, the effects of surfactants of different types have been studied: catamine AB, oxy-phos B, synthanol ALM-10 on the spectrophotometric characteristics of scandium with xylenol orange (XO). For complexation of scandium with XO, the optimum pH range is 1.56–2.44, the introduction of catamine AB under these conditions does not significantly affect the spectrophotometric characteris-tics of the complexes. The bathochromic shift from 508 to 637 nm and an increase in the intensity of light absorption by almost three times in the XO – Sc system — katamine AB occurs at a pH of 6.15 in the presence of 5.2 ·10–4 M concentration of katamine AB, however, the stability of the complexes up-on standing does not exceeds 30 minutes. Saturation and isomolar series at pH 1.56 determined the composition of Sc complexes with xylenol orange. In the absence of surfactant, the Sc: XO compound of 2:1 is first formed, and with an excess of reagent it goes into a 1:1 complex, in the presence of katamin AB, a 1:1 complex is formed, and with an excess of reagent 1:2. Oxyphos B and synthanol ALM-10 practically do not affect the process of complexation of scandium with XO.