4，5－二溴邻硝基苯基荧光酮光度法测定微量镓

摘要

研究了镓与4，5-二溴邻硝基苯基荧光酮（DBON-PF）的显色 反应，在盐酸—氯化钾介质中，有CTMAB存在下，显色反应灵敏，镓与 DBON-PF络合物的最大吸收波长在757nm，络合物的表观摩尔吸光 系数ε＝8.2×104。含镓0～5μg／25mL遵守比耳定律。用乙酸丁 酯萃取分离干扰元素，可以大大提高方法的选择性。该法用于矿石中微量镓的 测定，获得了满意的结果。%The colour reaction of gallium　with 4, 5-dibromo-2-nitro-phenylfluorone(DBON-PF) was investigated. In the medium of HCl-KCl solution containing CTMAB the colour reaction is sensitive. The complex of Ga 　with DBON-PF has a maximum absorption at 575nm. The apparent molar absorptivity is 8.2 ×104 L*mol-1*cm-1. Be er's law is obeyed for 0-5μg gallium in 25mL solution. The interference of foreign ions was eliminated by extraction with n-butyl acetate. The method has been applied to the determination of trace gallium in ore with satisfactory results.