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本文根据碱法炼铅新工艺中铅的纯度很高的特点,于pH=2—5的硝酸-乙酸铵介质中,用钼酸铵直接滴定硝酸铅,在导数示波极谱仪上借铅波消失来指示终点。试验了pH、硝酸、乙酸铵、阿拉伯树胶对滴定终点的影响,选定了最宜的滴定条件。在选定的条件下,滴定终点明晰,60—100毫克铅与钼酸铵消耗量成正比关系。方法简单、快速,相对标准偏差在0.2％以内。共存的少量杂质无干扰。
Based on the high purity of lead in the new lead smelting process, titration of lead nitrate with ammonium molybdate directly in nitric acid - ammonium acetate solution at pH = 2-5, leaching by lead in oscilloscope The wave disappears to indicate the end. The effects of pH, nitric acid, ammonium acetate and gum arabic on the titration end point were tested. The optimal titration conditions were selected. Under selected conditions, the titration endpoint is clear, 60-100 mg lead is directly proportional to the consumption of ammonium molybdate. The method is simple and fast, the relative standard deviation is within 0.2%. Coexistence of a small amount of impurities without interference.