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本文研究了在碱性介质中,一甲胺和对硝基苯胺重氮盐形成的偶氮化合物的极谱行为,并建立了微量一甲胺极谱测定方法。方法的最低检出限0.05μg/5ml,变异系数1.1～4.5％(0.25～4.0μg/5ml),加标回收95～104％,50倍共存的二甲胺、三甲胺、二乙胺不干扰测定。4倍的苯胺、2倍的一乙胺共存时有干扰。方法已用于空气中一甲胺的测定,取得了满意的结果。
In this paper, we study the polarographic behavior of azo compounds formed from monomethylamine and p-nitroaniline diazonium salts in alkaline medium and establish a method for the determination of trace methylamine. The minimum detectable limit of this method was 0.05μg / 5ml and the coefficient of variation was 1.1-4.5% (0.25-4.0μg / 5ml). The method of standard addition did not interfere with dimethylamine, trimethylamine and diethylamine in 95 ~ 104% Determination. 4 times the aniline, 2 times the presence of ethylamine interference. The method has been applied to the determination of monomethylamine in the air and satisfactory results have been obtained.