Potentiotitrimetric Determination of Available Calcium Oxide in Lime

Content of available calcium oxide in lime was determined by potentiometric titration using HCl standard solution as titrant. Conditions of titration were optimized and given as follow: ① acidity at endpoint of titration: pH 7.00; ② maximum rate of titration: 10 mL·min-1; ③ minimum rate of titration: 100 μL·min-1; ④ delay time: 5 s. The proposed method was applied to the analysis of lime sample, and the results obtained were checked quite well with those obtained by manual titration. Values of RSD′s (n=5) were found in the range of 0.10%-0.19%.