【摘要】 溴邻苯三酚红（BPR）和铌（V）在阳离子表面活性剂溴化十六烷基吡啶（CPB）和非离子表面活性剂乳化剂OP存在下,在pH6.5～7.0的适宜酸度范围内,形成一深蓝色的络合物。其最大吸收波长位于635nm处。络合物的组成为:Nb（V）:BPR:（CPB）oP=1:4:8,50ml溶液中,0～22μg的Nb（V）遵守比尔定律。此络合物的表观摩尔吸光系数为1.41×10⁵l·mol^-1·cm^-1。在EDTA的存在下,考察了31种共存阳离子和6种共存阴离子的干扰情况。更多还原

【Abstract】 Niobium（V）forms an intense blue complex with BPR in the presence of cationic-CPB and non-ionic-emulsifier OP surfactant. The complex is stable, over the pH range of 6.5 to 7.0 with naximum absorption at the wavelength of 635 nm. The molar ratio of Nb/BPR/（CPB）op has been found to be 1: 4: 8. The Lambert Beer＇s law is obeyed in the concentration range of O to 22μg for Nb（V） in 50 ml and the apparent molar absorptivity is 1.41×10⁵ l·mol^-1·cm^-1. In the presence of EDTA the interference of 31 cations and 7 anions was examined. Some tentative suggestions regarding structure of the complex and the mechanism of the complexation have also been discussed.更多还原