Cigarette smoke pH (potential of hydrogen) regulating model building method and regulating method

The invention discloses a cigarette smoke pH (potential of hydrogen) regulating model building method and regulating method, and belongs to the technical field of cigarettes. The building method includes the steps: (1) measuring the content of nicotine in different forms of unblended cigarettes in a cigarette sample and tobacco blend; (2) measuring the pH value of smoke of the cigarette sample; (3) analyzing correlation of the content of the nicotine in different forms in the cigarette sample and the pH value of the smoke to obtain a regression equation Y1=5.793+0.811X2-0.803X4, Y2=5.769+0.754X2-0.674X4, namely, a cigarette smoke pH regulating model. The cigarette smoke pH regulating method includes the steps: determining the pH value Y1 of a cigarette sample particulate matter needing regulation and the target value of the pH value Y2 of full smoke, and substituting the values into the regulating model to obtain free nicotine X2 and free nicotine/total nicotine X4; calculating the proportion of the unblended