EDTA滴定法准确测定钢铁除锈废酸中锌离子含量  

Accurate determination of zinc ion content in rust removal waste acid of steel by EDTA titration

作　　者：许艳 康会英 陈亚鹏[2] 张炳烛[2] 刘悦 XU Yan;KANG Huiying;CHEN Yapeng;ZHANG Bingzhu;LIU Yue(Shijiazhuang Dong Wu Environmental Technology Co.,Ltd.,Shijiazhuang Hebei 052160,China;Hebei Chemical&Pharmaceutical Vocational Technology College,Shijiazhuang Hebei 050026,China)

机构地区：[1]石家庄东午环保科技有限公司,河北石家庄052160 [2]河北化工医药职业技术学院,河北石家庄050026

出　　处：《河北省科学院学报》2024年第4期60-65,共6页Journal of The Hebei Academy of Sciences

基　　金：河北化工医药职业技术学院资助(YZ201915)。

摘　　要：针对钢铁除锈的废酸综合利用过程中锌离子含量不能准确测定的问题,本文提出了一种利用pH控制沉降铁离子,采用EDTA滴定法准确测定钢铁除锈废酸中的锌离子含量的方法,并通过多项式拟合,得到锌离子含量的拟合曲线的回归方程。研究分析了Fe^(3+)、Fe^(2+)对测量结果的影响,提出了解决方法,同时发现加入聚丙烯酰胺(PAM)做絮凝剂可加快Fe^(3+)的沉降。本方法可为此类废酸的综合利用提供检测依据。In response to the problem of inaccurate determination of zinc ion content in the comprehensive utilization process of rust removal waste acid,a method of accurately determining the zinc ion content in rust removal waste acid by using pH control for settling ferric ions and EDTA titration is propoesd in this paper.Through polynomial fitting,the regression equation of the fitted curve for zinc ion content is obtained.The effect of Fe^(3+) and Fe^(2+) on the results is studied and analyzed,and solutions are proposed.It is also found that the addition of polyacrylamide(PAM) as a coagulant can accelerate the precipitation of Fe^(3+).This method can provide a basis for the comprehensive utilization of such waste acids.

关 键 词：废酸 EDTA滴定法 锌含量测定 氢氧化锌的两性 拟合曲线 PAM 

分 类 号：O655.24[理学—分析化学]