采用氨气隙电极可以测定固体催化剂中微量的残铵。其线性范围为10~(-5)—10~(-2)M。对测量时的温度、固体样品浸泡时间、碱液浓度和称样多少等条件进行了试验。本法测定范围为0.000x—0.2％,平均偏差为10—30％。该法具有简易、快速、灵敏、样品少等特点。实验不宜在含酸、碱及有机气氛的实验室內进行。 Ammonia gap electrodes can be used to measure trace amounts of ammonium residues in solid catalysts. The linear range of 10 ~ (-5) -10 ~ (-2) M. The temperature during measurement, solid sample soaking time, concentration of lye and how much the sample was tested. The scope of this method is 0.000x-0.2% with an average deviation of 10-30%. The method is simple, fast, sensitive, less sample and so on. Experiments should not be carried out in laboratories containing acid, alkali and organic atmosphere.