自动电位滴定法测定烟气氨法脱硫模拟浆液中氯离子的研究

The Study on Detection of Chloride Ion in Flue Gas Ammonium Sulfate Slurry by Automatic Potentiometric Titration Method

氯离子含量是氨法脱硫工艺中的一个重要监控指标,用自动电位滴定法测定氨法脱硫浆液中的氯离子。结果表明,实验加入乙醇有利于增大电位突跃幅度;pH值为3~5时实验结果准确;加标回收率为90%~110%;与莫尔法相比,测定结果准确度、精密度更高,且不受灰分颜色干扰;与离子色谱法测定结果准确度、精密度相近,但测定高浓度氯离子电位滴定法更有优势。

Chloride ion content of ammonia desulfurization process is an important monitoring indicators and this paper discusses the detection of chloride ions in ammonium sulfate slurry by automatic potentiometric titration. The results show that： adding ethanol helps to increase the magnitude of the potential jump; when pH = 3-5,the result is accurate; the recovery rate keeps between 90% and 110%; compared with the Mohr method,the test result is more accurate and precise and free from ash color; also the tested result is close to ion chromatography detection result,but the high concentrations of chloride ion potentiometric titration is more advantageous.