中成药中铝含量的光度法测定

Spectrophotometric Determination of Aluminium in TCM

研究了二溴羟基苯基荧光酮与铝的显色体系。在Tween-80及F^-存在下，铝与二溴羟基苯基荧光酮在碱性介质中形成1：2的玫瑰红色四元配合物，最大吸收波长558nm，摩尔吸光系数1．5×10^5L·mol^-1·cm^-1，铝含量在0-0．24μg/mL符合比尔定律。方法灵敏，选择性好，用于中成药中微量铝的测定取得满意结果。

In the presence of Tween- 80 and fluoride ion, aluminium （Ⅲ） reacts with dibromohydroxy phenylfluorone （DBH-PF） in alkanine solution to form a rose colored four-component-complex with its absorption maximum at 558 nm, and molar absorptivity of 1.5 × 10^5 L·mol^-1· cm^-1. Beer＇s law holds in the concentration range for aluminium （Ⅱ ） of 0 - 0.24μg/mL. The proposed method proves to be sensitive and selective, and has been applied to the determination of microamounts of aluminium in traditional Chinese medicine with satisfactory results.