二溴羟基苯基荧光酮光度法测定铅的研究

Study on the Spectrophotometric Determination of Lead With DBH-PF

研究了铅与二溴羟基苯基荧光酮在阳离子表面活性剂十六烷基三甲基溴化铵存在下的显色反应。在硼酸盐缓冲介质中铅与二溴羟基苯基荧光酮在十六烷基三甲基溴化铵 ( CTMAB)存在下形成红色络合物 ,最大吸收波长为 5 4 0 nm,表观摩尔吸光系数为 6.1× 1 0 4 L· mol- 1· cm- 1。铅含量在 0～ 30μg/2 5 m L符合比耳定律。本法应用于测定市售化妆品、人工湖水中的铅 。

The color reaction of DBH PF with lead and its application has been investigated. A red complex of Pb 2+ with DBH PF in the presence of cationic surfactant CTMAB formed in the borate buffer solution at pH range of 9.20～10.03. The maximum absorption of the complex appeared at 540 nm, and the apparent molar absorptivity was 6.1×10 4 L·mol -1 cm -1 . Beer's law was obeyed in the Pb 2+ amount range of 0～30 μg/ 25 ml. This method has been applied to the determination of trace lead in cosmetics and water successfully.