4,5-二溴邻硝基苯基荧光酮光度法测定铝合金中微量铜

Spectrophotometric determination of trace copper in aluminium alloys with 4,5dibromoonitrophenylfluorone

研究了4,5-二溴邻硝基苯基荧光酮(DBON PF)与铜的显色反应条件,在pH8的硼砂-硼酸介质中,有OP存在下,DBON PF与铜 形成紫红色络合物,最大吸收波长为590nm,测得有色络合物的表观摩尔吸光系数ε=1 27×105,铜量在0～15μg/25mL范围内符合比尔定律。方法灵敏度高,快速、简便。应用本法测定了铝合金中微量铜,获得了满意的结果。

In the medium of Na2B4O7(pH 8),the color reaction of copper*'with 4,5dibromoonitrophenylfluorone(DBONPF)was investigated in the presence of OPA red violet complex of copper*'with DBONPF was formedIts maximum absorption is at 590nm,and the apparent molar absorptivity is 127×105 L·mol-1·cm-1Beer's law is obeyed in the range of 0-15μg/25mL for copperThis method possesses advantages of high sensitivity,simplicity and rapidityIt is applied to the determination of trace copper in aluminium alloys with satisfactory results