自动电位滴定法同时测定脱硫浆液中钙和钙镁总量

Automatic Potentiotitrimetric Determination of Amount of Ca and Total Amount of Ca-Mg in Desulfurizing Pasty Liquor

采用自动电位滴定法,在pH 10的氨-氯化铵缓冲溶液中,用EDTA标准溶液作为滴定剂,同时测定脱硫浆液中钙和钙镁总量。方法用于测定脱硫浆液中钙和镁的含量,镁的回收率在98.2%～100.4%之间,相对标准偏差(n=5)为0.48%～0.64%;钙的回收率在97.6%～100.7%之间,相对标准偏差(n=5)为0.54%～0.99%。

The content of Ca and total content of Ca-Mg in desulfurizing pasty liquor were determined by automatic potentiometric titration using EDTA standard solution as titrant in an ammoniacal buffer solution of pH 10, The proposed method was applied to the determination of Ca and Mg in samples of desulfurizing pasty liquor, giving values of recovery and RSD＇s （n=5） in the ranges of 98. 2%--100. 4% and 0. 48%--0. 64% for Mg; and 97.6%--100. 7% and 0. 54%-0. 99% for Ca respectively.