自动电位滴定法测定脱硫系统中氯化物  

Automatic Potentiotitrimetric Determination of Chloride in Desulfurizing System

作　　者：宋晓红[1] 高姗[1] 杨杰[1] 马东伟[1] 

机构地区：[1]河北省电力研究院,石家庄050021

出　　处：《理化检验（化学分册）》2011年第6期684-686,共3页Physical Testing and Chemical Analysis(Part B:Chemical Analysis)

摘　　要：应用自动电位滴定法,在总离子强度缓冲溶液存在的情况下,在pH 5的微酸性水溶液中,用0.05mol·L^(-1)硝酸银标准溶液作为滴定剂,测定了脱硫系统样品中氯化物含量。试样用水浸取溶出氯化物,共存亚硫酸盐的干扰采用在近中性条件下加入过氧化氢煮沸至无小气泡产生予以消除,对试样的预处理方法以及各项影响测定的参数等做了试验并予以优化。方法用于测定脱硫废水、脱硫浆液和脱硫石膏样品中氯化物,加标回收率在95.7%～102.0%之间,相对标准偏差(n=5)在1.2%～5.9%之间。The content of chloride in desulfurizing system was determined by automatic potentiometric titration using 0. 05 mol . L-1 AgNO3 standard solution as titrant in a weakly acidic solution of pH 5, containing total ionic strength buffer. Soluble chloride in the sample was extracted with water. Interference of sulfite was eliminated by boiling the nearly neutral sample solution with H2O2 until ceasing of gas-bubbling. Methods of pretreatment of sample, and various parameters affecting the titration were studied and optimized. The proposed method was applied to the determination of chloride in desulfurizing samples of waste water, pasty liquor and gypsum, giving values of recovery and RSD＇s （n= 5） in the ranges of 95. 7%- 102. 0% and 1. 2%- 5. 90% respectively.

关 键 词：自动电位滴定法 氯化物 脱硫系统 

分 类 号：O657.15[理学—分析化学]