This standard specifies the method for the determination of calcium carbonate in cigarette paper, using the potential Titrimetric method. It is suitable for cigarette paper with calcium carbonate as the main filler. A series of documents are cited, including the preparation of standard titration solutions for chemical reagents and cigarette paper, etc. The principle of determination is to first react with excess acid solution with calcium carbonate in cigarette paper, and then titrate excess acid with alkali solution of known concentration to calculate the calcium carbonate content expressed in calcium oxidation (CaO) content. The reagents and materials should be analytically pure reagents, and the test water should be distillation water. Standard solutions of sodiumhydrate and muriatic acid are required. Use pH Meter with accuracy of 2 mV or Automatic Potentiometric titrator and Balance with sensitivity of 0.01 g.