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在自然界中,氮的循环以硝酸根状态出现是一种重要的过程。所以,硝酸根的测定受到国内外环保和生化工作者的重视。多年来,许多分析工作者应用各种不同的方法进行过硝酸根的测定研究,极谱法也是常用方法之一。我们采用回转玻璃碳圆盘电极～导数脉冲极谱法,借测定硝酸根存在时镉的催化电流,间接测定硝酸根含量,可达亚PPb NO_3~-数量级。药品及仪器:药品均为保证试剂,水为三次蒸馏水。低浓度溶液使用前临时配制。仪器是本组自装的JP～M型脉冲极谱仪;XBD-1型回转玻璃碳圆盘电极。
In nature, it is an important process that the nitrogen cycle appears as a nitrate. Therefore, the determination of nitrate by environmental protection and biochemical workers at home and abroad attention. For many years, many analysts have used a variety of different methods for nitrate determination. Polarography is also one of the commonly used methods. We adopted the rotary glass carbon disk electrode derivative pulse polarography, by measuring the catalytic current of cadmium nitrate, the indirect determination of nitrate content, up to PPB NO_3 ~ - orders of magnitude. Drugs and equipment: Drugs are guaranteed reagents, water for the three distilled water. Low concentrations of solution used before the temporary preparation. Instrument is installed in this group JP ~ M-type pulse polarography; XBD-1-type rotary glass carbon disk electrode.