可再生湿法烟气脱硫过程有机胺吸收液中硫酸根的测定

摘要

为了快速准确测定可再生湿法烟气脱硫过程有机胺吸收液中的p(SO2-4),建立了以茜素红为指示剂,用BaCl2直接滴定测定有机胺吸收液中p(SO2-4)的方法.实验结果表明:当试样pH为4.0 ～4.5时,方法的相对误差为0.28％-0.62％,加标回收率均在97％以上；SO2-3的存在会使p(SO2-4)的测定结果偏大,但偏差在1.55％以内；烟气中CO2的存在不影响p(SO2-4)的测定.%In order to determine accurately ρ(SO42- ) in regenerable amine absorption liquid, the new method was established by BaCl2 direct titration using alizarin red as indicator. The experimental results show that; When the sample pH is 4. 0 -4. 5, the relative error of the method is 0.28% -0.62%, the recovery of standard addition is above 97% ; The presence of SO32- will lead to a larger determinationvalue, but the deviation will be less than 1.55% ; CO2 in flue gas has no effect on the determination of ρ(SO42-).