流动注射化学发光增强法测定焦性没食子酸

Determination of Pyrogallol by Flow Injection with Enhanced Chemiluminescence Detection

在较低 p H值的 Na OH介质中 ,焦性没食子酸对 Luminol- K3 Fe(CN) 6化学发光体系有很强的增敏作用 ,据此建立了焦性没食子酸的测定方法——流动注射化学发光增强法。该法的化学发光增强值 (ΔI)与焦性没食子酸浓度 (在 3.0× 10 -9— 1.0× 10 -6mol/ L范围内 )呈良好的线性关系 ,检出限为 1.0× 10 -9mol/ L(n=11) ,对 5× 10 -8mol/ L焦性没食子酸测定的相对标准偏差为 2 .8%。用于没食子酸热解产物中的焦性没食子酸测定 。

A novel flow injection procedure was developed for the determination of pyrogallol based on the enhancement of the chemiluminescence from luminol-K 3Fe(CN) 6 system by pyrogallol. The method is simple with high sensitivity and selectivity in a wide linear range. It is applicable for the determination of pyrogallol in the range of 3 0×10 -9 -1 0×10 -6 mol/L with a detection limit of 1 0×10 -9 mol/L. The relative standard deviation is 2 8% for the determination of 5 0×10 -8 mol/L pyrogallol ( n =11). This method has been successfully applied to determine the content of pyrogallol in a pyrolysis mixture of gallic acid.