取卷烟纸或造纸法再造烟叶细条（约0.5 cm×2.5 cm）样品0.500 g，与0.5 mol·L^-1盐酸溶液4.5 mL反应完全，加入95.5 mL水，混匀后过滤，于滤液中加入5 g活性碳，振荡30 min，过滤，收集滤液。采用连续流动法通过碘酸钾、碘化钾与样品溶液中剩余H⁺的显色反应来计算剩余H⁺的含量，从而推算样品中碳酸钙的含量。结果表明：①碳酸钙的线性范围为5.007~30.042 mg；②方法的检出限（3s）为0.11 mg；③连续测定6次所得结果的相对标准偏差为0.34%~0.86%；④加标回收率为96.6%~103%。方法的测定值和电位滴定法的测定值基本相符，但与离子色谱法所测结果之间有一定差异。

The sample (0.500 g) of strips (about 0.5 cm×2.5 cm) of cigarette paper or reclaimed tobacco leaves made by the paper-making process was taken and reacted completely with 4.5 mL of 0.5 mol·L^-1 HCl solution. Water (95.5 mL) was added, and the mixture was mixed well and filtered. Granulated active carbon (5 g) was added to the filtrate, and the mixture was mixed thoroughly for 30 min and filtered again. The filtrate was collected and its content of calcium carbonate was determined by continuous flow method through the color reaction among KIO₃, KI and H⁺ remained in the sample solution, and based on the content of H⁺ found, calcium carbonate was calculated. It was found that:① linearity range of calcium carbonate was 5.007-30.042 mg; ② detection limit (3s) of the method was 0.11 mg; ③ RSDs (n=6) for the results were found between 0.34% and 0.86%; ④ values of recovery found by standard addition method ranged from 96.6% to 103%. The results found by the present method were as a whole in consistency with those found by potentiometric titration, but obvious deviations were found as compared with the results given by ion chromatography.