Cephas H. Sloan

Parameters Affecting the Selective Filtration of Certain Tobacco Smoke Components

Abstract The purpose of this investigation was to attain a better understanding of the selective removal of certain compounds from cigarette smoke by filters. A gas chromatographic method for the determination of selected semivolatile smoke compounds was developed. The method, which utilizes a 160 m glass capillary column, was used to determine the efficiency of filters for the removal of these selected semivolatile compounds. A correlation was found between the selective filtration of these compounds from cigarette smoke and their distribution coefficients [Kd = (g compound/g filter)/ (g compound/cm3 air)] between air and various filter materials. In addition, a correlation was found between the physicaI and chemical nature of certain smoke compounds and their selective filtration. Previous work indicated that if a compound is to be selectively removed from tobacco smoke by a filter, [1] a significant portion of that compound should be in the vapour state as it passes through the filter and [2] the compound should have an affinity for the filter material. The relative rate of vapourization (Rv) was used as a measure of 1., and the totaI solubility parameter (d) was taken as a measure of 2. Values for the vapourization rate were calculated from the product, vapour pressure (P), molecular weight (M), and diffusion coefficient (D), (Rv = kPMD1/2). The correlation of Rv and δ with the selectivity (Sx) of cellulose acetate filters for smoke compounds is described by Sx = b0 + b1δ + b2δ (1n Rv), where b0, b1, and b2 are constants. This equation may be used to predict the selective filtration of semivolatile compounds from cigarette smoke.

Coulometric Determination of Hydrogen Cyanide in Cigarette Smoke

Abstract We have described a method for determining the HCN delivered in whole cigarette smoke and in smoke condensate extracted from filters. The method is simple, rapid and precise. It eliminates many manual operations and is semi-automatic.