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

摘要

Chloride ion content of ammonia desulfurization process is an important monitoring indicators and this paper dis-cusses 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 .%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。