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基于在稀H2 SO4介质中 ,十二烷基硫酸钠对NO-2 催化KBrO3氧化藏红T褪色反应的增敏作用 ,建立了测定NO-2 的催化动力学光度法 ,灵敏度较不加十二烷基硫酸钠的方法提高了 5.6倍。测定NO-2 的线性范围为 1 0～ 1 40 μg/L ,检出限为 6μg/L。方法用于水样中NO-2 的测定 ,与格里斯法相符 ,加标回收率为 96%～ 1 0 6% ,5次测定的RSD <5%。
Based on the sensitizing effect of sodium dodecyl sulfate on the fading reaction of KBrO3 red red T catalyzed by NO-2 in dilute H2 SO4 medium, a catalytic kinetic spectrophotometric method was established for the determination of NO-2 with a sensitivity of 12 The method of sodium alkyl sulfate increased by 5.6 times. The linear range of NO-2 was 10 ~ 1 40 μg / L with the detection limit of 6 μg / L. The method was applied to the determination of NO-2 in water sample, which was consistent with Gris’s method. The recoveries were 96% ~ 106%. The RSDs of 5 determinations were less than 5%.