【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 75 7nm ,络合物的表观摩尔吸光系数ε =8 2× 10 4。含镓 0～ 5 μg/ 2 5mL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。更多还原

【Abstract】 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 ×10 4 L·mol -1 ·cm -1 . Beer’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.更多还原