工厂检测锌灰中锌离子含量方法的问题探究  

Study on the method of zinc content detection in zinc ash

作　　者：吴焕 赵沛 黄大伟 次立杰[1] Wu Huan;Zhao Pei;Huang Dawei;Ci Lijie(Shijiazhuang University,Shijiazhuang 050035,China)

机构地区：[1]石家庄学院,河北石家庄050035

出　　处：《煤炭与化工》2021年第4期147-150,共4页Coal and Chemical Industry

基　　金：石家庄学院创新创业训练计划项目(SCXM2019038)。

摘　　要：针对工厂检测锌灰中锌离子含量方法,EDTA络合滴定法存在检测准确度低的问题,通过实验比较了工厂检测法与以二甲酚橙为指示剂测定锌灰中锌离子含量方法,找到工厂检测法检测锌含量偏高的原因。结果表明,检测锌灰中锌离子时,工厂检测法没有加入掩蔽剂来排除其他离子的干扰,即没有掩蔽Fe^(3+)、Al^(3+)对指示剂的封闭干扰,而二甲酚橙法则加入了掩蔽剂;工厂检测法在检测操作手法上不规范,如在滴定时滴定速度过快,容易滴定过量,从而导致检测的锌灰中锌离子的含量偏高。In view of the low accuracy of EDTA complexometric titration method for the determination of zinc ion content in zinc ash in the factory,this paper compares the factory detection method with the method using xylenol orange as indicator for the determination of zinc ion content in zinc ash and finds out the reason for the high zinc content in the factory detection method.The results show that the factory detection method does not add masking agent to eliminate the interference of other ions when detecting zinc ions in the zinc ash,that is it does not cover the closed interference of Fe^(3+)and Al^(3+)to the indicator,while the xylenol orange method adds masking agent;the factory detection method is not standardized in the detection operation,such as the titration speed is too fast,it is easy to titrate too much,resulting in the detection of zinc ash the content of zinc ion is high.

关 键 词：准确度 EDTA络合滴定 铬黑T 二甲酚橙 

分 类 号：O656.32[理学—分析化学]