基于亚硝酸根在酸性条件下对溴酸钾氧化胭脂红酸的褪色反应的催化作用 ,将反相流动注射技术与催化光度法相结合测定亚硝酸根的含量。对实验条件进行了优化。室温下 ,当 [KBr O3 ]=0 .14 mol/L,[胭脂红酸 ]=3.2× 10 -4mol/L,[H2 SO4]=1.4 mol/L时 ,方法的线性范围为 1— 10 ng/m L,检出限为0 .7ng/m L。用于几种河水水样测定 ,结果满意。 Based on the catalytic effect of nitrite on the fading reaction of carmine bromate induced by potassium bromate under acidic conditions, the nitrite content was determined by the combination of reversed-phase flow injection and catalytic spectrophotometry. The experimental conditions were optimized. The linear range of the method was 1 to 10 ng at room temperature with [KBr O3] = 0.14 mol / L, [carminic acid] = 3.2 × 10 -4 mol / L and [H2 SO4] = 1.4 mol / / m L, the detection limit of 0. 7ng / m L. For several river water samples, the results are satisfactory.