废弃化学品中锌元素常量测定方法探讨

Discussion on determination method of zinc constant in waste chemicals

准确测定废弃化学品中锌元素含量是促进锌资源利用与再生的关键。为准确测定废弃化学品中锌的含量及形成行业标准,就废弃化学品中锌含量测定方法化工行业标准制定过程中锌测定的样品处理及常量测定方法进行了介绍,通过试验验证标准中利用沉淀杂质分离后返滴定法测定常量锌含量的相对标准偏差范围为0.36%~2.72%,样品试验加标回收率为97.4%~100.4%。得出结论:锌质量分数大于4.0%的废弃化学品采用该方法测定是可行的。

Accurate determination of zinc content in waste chemicals is the key to promote the utilization and regeneration of zinc resources.In order to accurately determine the zinc content in waste chemicals and formulate industry standards,the determination methods of zinc content in waste chemicals in the process of formulating chemical industry standards were introduced,including sample treatment and constant determination methods.The relative standard deviation for determining the major content of zinc by back titration after separation of precipitated impurities is 0.36%~2.72%,and the recovery rate of standard addition in sample test is 97.4%~100.4%.It is concluded that it is feasible to determine waste chemicals with zinc content greater than 4.0%by this method.