催化光度法测定痕量亚硝酸根——溴酸钾-猩红3B体系

Catalytic Spectrophotometric Determination of Trace Nitrite： Potassium Bromate-Scarlet 3B

基于稀磷酸介质中亚硝酸根催化溴酸钾氧化猩红3B的褪色反应，建立测定痕量亚硝酸根的新方法．方法检出限为i．36×10^-6g／L，线性范围为12-80×10^-6g／L，回收率为98．8％～101．0％．方法已用于水中亚硝酸根的测定，结果满意．

A new catalytic spectrophotometic method for determination of trace nitrite is developed, The method is based on the catalytic effect of NO2^- on oxidation of Scarlet 3B by potassium bromate in H3PO4 mediun. The detection limit for nitrite is 1.36 ×10^-6 g/L. The linear range of the determination is 12-80 ×10^-6 g/L and the recoveries are between 98. 8 %- 101.0%. The method is applied to direct determination of nitrite in water with satisfactory results.