环境水样中(NO_2)^-的催化光度法测定

The Determination of the (NO_2)^- in the Water Sample by Catalytic Photometry

提出了催化褪色光度法测定痕量NO2 - 的新方法。此法是基于百里香酚蓝在H2 SO4 介质中被KBrO3氧化的反应受到痕量NO2 - 的催化。本法的检测限为 4 .6× 10 - 8g/mL ,测定范围为 2～12 μg/ 2

A new catalytic fading spectrophotometric method for the determination of trace NO 2 - is descried.This method is based on the oxidation of Thymol blue by KBrO 3 in H 2SO 4 medium catalyzed by NO 2 -.The detection limit is 4.6×10 -8 g/mL,the determination range of NO 2 - is 2～12μg/25mL. The proposed method has been used for analysis of water sample,with satisfactory results.