混合表面活性剂存在下水杨基荧光酮r分光光度法测定微量铌

摘要

Chromogenic system (niobium (Nb5+ )-hexadecyltrimethylammonium bromide (CTMAB )-arabic gum(AG)-salicylfluorone (SAF))for determining trace niobium was developed .The results show that in the presence of CTMAB and AG in the medium of 5 mol/L chloride acid ,Nb5+ reacts with SAF to give a orange-red complex whose the maximum adsorption wavelength is at 520 nm ,and the apparent molar absorptivity is 1 .38 × 105 L · mol-1 · cm -1 .Beer′s law is obeyed in the range of 0～0 .48 μg/mL for Nb5+ mass concentrate .%研究了用十六烷基三甲基溴化铵(CTMAB)-阿拉伯树胶(AG)-水杨基荧光酮(SAF)显色体系测定微量Nb5+.结果表明:在加入CTMAB和AG的5 mol/L盐酸介质中,Nb5+与水杨基荧光酮可形成最大吸收波长为520 nm的橘红色配合物,配合物的表观摩尔吸光系数为1.38×105 L·mol-1·cm-1,Nb5+质量浓度在0～0.48μg/m L范围内符合比尔定律.