湿法烟气脱硫石膏浆液中镁离子含量测定方法的探究

Study on Determination Method of Magnesium Ion in Wet Flue Gas Desulfurization Gypsum Slurry

湿法烟气脱硫石膏浆液中镁离子含量较高,因此测定采用络合滴定法,在p H值=10的氨水—氯化铵缓冲溶液中,以酸性铬蓝K-萘酚绿B为指示剂,用EDTA络合滴定法测定钙、镁离子合量;另在氢氧化钾溶液中,用钙黄绿素为指示剂,以EDTA络合滴定法测定钙离子含量,用差减法计算镁离子的含量。

With higher content of magnesium ion in wet flue gas desulfurization gypsum slurry, the complexometric titration has been put to use. In the ammonia-ammonium chloride buffer solution with a p H value of 10, it takes an EDTA complexometric titration to measure the content of calcium and magnesium ions with acid chrome blue K-naphthol green B as the indicator; and in the potassium hydroxide solution, it takes an EDTA complexometric titration to measure the content of calcium ion with calcein as the indicator, the content of magnesium ion is measured by the minusing.