催化褪色光度法测定环境水样中痕量亚硝酸根

Catalytic Fading Photometric Determination of Trace of Nitrite in the Enviroment Water Kind Inside

研究了在稀磷酸介质中亚硝酸根催化溴酸钾氧化中性红的褪色反应及动力学条件 ,建立了一个新的测定痕量亚硝酸根的方法。其灵敏度为 1 .4× 1 0 -8g/ m L,测定范围为 0 .1～ 2 .0 μg/ 2 5m L,方法简单、快速 ,分析费用低 ,用于测定水样中的痕量 NO-2 ,获得满意的结果。

A kinetic method in phosphoric acid is proposed for determining trace amount of nitrite. The method is based on the catalytic reaction of nitrite on the color fading of neutral red by oxidation with potassium bromate. The sensitivity of the method is 1.4×10 -8 g/mL, and the range of determination is 0.1 ~2.0 μg/25 mL.