基于在稀磷酸介质中,亚硝酸根对溴酸钾氧化二氯荧光素反应的催化作用,建立了催化荧光法测定亚硝酸根的新方法.反应在70℃水浴中进行10min,是假零级反应,方法的线性范围为0.4～8.0μg·L-1,检出限为2.0×10-10g·ml-1.该法简便、灵敏、选择性好,应用于水样中痕量亚硝酸根的测定,结果满意. Based on the catalytic effect of nitrite on the reaction of dichlorofluorescein with potassium bromate in dilute phosphoric acid medium, a new method for the determination of nitrite by catalytic fluorimetry was established.The reaction was carried out in 70 ℃ water bath for 10min, The method has a linear range of 0.4 ~ 8.0μg · L-1 with a detection limit of 2.0 × 10-10g · ml-1. The method is simple, sensitive and selective and is applicable to the determination of trace nitrite in water samples Satisfactory results.