摘要
研究了9-(3-硝基苯基)-2,3,7-三羟基-4,5-二溴-6-荧光酮(简称DBNPF)与钨的显色反应条件.在表面活性剂CTMAB存在下,HCI介质中,钨与DBNPF生成1:3(M:L)配合物,其最大吸收峰在550nm处,表观摩尔吸光系数ε=1.1×105L·mol-1·cm-1,钨含量在0—9μg/25mL范围内符合比耳定律,大多数常见阳离子不干扰测定.本方法用于合成样品中微量钨的测定,结果满意.
The colour reaction of tungsten (Ⅳ ) with 9- (3-nitrophenyl) -2, 3, 7-trihydroxy-4, 5-dibromo-6-fluorone (DBNPF) in the presence of CTMAB has been investigated.Tungsten (Ⅳ) react rapidly with DBNPF to form 1:3 (M: L) complex with maximum absorption at 550nm, its molar absorptivity being 1.1 ×105L·mol-1·cm-1. Beer's law is obeyed for 0-9 μg of tungsten (Ⅳ) in 25mL. Most of other metal ions do not interfere with the determination. The method has been used to det ermifle tungsten in sample with satisfactory,results.
出处
《襄樊学院学报》
1999年第5期49-52,共4页
Journal of Xiangfan University