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本文叙述了用邻、间和对位三种氨基苯甲酸重氮化的差示脉冲极谱测定亚硝酸盐的简便、灵敏、快速方法,检测下限分别为8 ppb、20ppb、4 ppb。设备:使用Metrohm Polarecord E 506极谱仪和E 505极谱仪台架(配有机械滴汞计时器)。使用三电极体系,滴汞电极为工作电极,Ag-AgCl电极为参比电极,铂丝电极为辅助电极。极谱条件:滴汞时间为2秒,脉冲振幅为100 mV,扫描速率为5 mV/秒,室温(25
In this paper, a simple, sensitive and rapid method for the determination of nitrite by diazotization of three aminobenzoic acid diazotization in ortho-, meta- and para-position is described. The detection limits are 8 ppb, 20 ppb and 4 ppb, respectively. Equipment: Metrohm Polarecord E 506 and E 505 polar stand with mechanical drop mercury timer. Using the three-electrode system, the drop mercury electrode is the working electrode, the Ag-AgCl electrode is the reference electrode, and the platinum wire electrode is the auxiliary electrode. Polarographic conditions: Mercury removal time of 2 seconds, pulse amplitude of 100 mV, scan rate of 5 mV / sec, room temperature (25