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用镉柱将NO-3 还原为NO-2 ,利用在磷酸介质中NO-2 对溴酸钾氧化亚甲蓝这一褪色反应具有强烈的催化作用而建立了同时测定痕量硝酸盐和亚硝酸盐的新方法。本方法简便、快速、灵敏 ,对亚硝酸盐和硝酸盐测定的线性范围分别为 0～ 2 0 0 μg·L-1和 0 0 0 3～ 310 μg·L-1,用于测定各种水样中痕量NO-2 和NO-3 的含量均获得满意结果
The reduction of NO-3 to NO-2 by a cadmium column has been established by the catalytic effect of NO-2 on the fading reaction of methylene blue by potassium bromate in a phosphoric acid medium. The simultaneous determination of trace nitrates and nitrites new method. The method is simple, rapid and sensitive. The linear range of nitrite and nitrate determination is 0 ~ 200 μg · L -1 and 0 0 03 ~ 310 μg · L -1, respectively. The contents of NO-2 and NO-3 in the samples all obtained satisfactory results