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本法采用了氢醌电极和饱和甘汞电极组成的电池测定HNO_3含量,采用了氢醌电极和氟离子选择电极组成的电池测定HF含量。在加入KCNS后可消除Fe(Ⅲ)的干扰。本法测定HNO_3的变动系数为1.6％～3.0％,测定HF的变动系数为1.4％—2.8％,HNO_3的回收率为92.5％—106％。由本法测定的HNO_3和HF的总和与容量法测得的总酸度相比,平均相对偏差在0.5％～4％之间。
This method uses a hydroquinone electrode and saturated calomel electrode composed of a battery to determine the content of HNO_3, a hydroquinone electrode and a fluoride ion selective electrode battery to determine the HF content. After adding KCNS can eliminate the interference of Fe (Ⅲ). The determination of the coefficient of variation of HNO 3 was 1.6% -3.0%, the coefficient of variation of HF was 1.4% -2.8%, and the recovery of HNO 3 was 92.5% -106%. The average relative deviation between HNO 3 and HF measured by this method is between 0.5% and 4% compared with the total acidity measured by the volumetric method.