Table 2

 Survey of internal industry methods for determining “smoke pH”34–39

MethodDescriptionIndustry use
Sensabaugh and Cundiff (1967)Puff-by-puff measure of whole smoke (vapour and PM) using solvent-coated glass electrode in smoke aerosolRJ Reynolds Tobacco Company (RJRTC): Sensabaugh technique used internally for “several years” before 1971
Brown & Williamson Tobacco Company (BWTC): Used experimentally… “Work reported by Honeycutt, Frank, and Johnson showed a range of over one pH unit… for similar cigarettes of the same brand style.” (1984–1989)
Backhurst (1966)Aqueous (cold-trapped) whole smoke measure using pH electrodeBWTC: Experimental use only
Artho and Grob (1966)Measure of smoke pH of PM collected on Cambridge pad and dissolved in waterBWTC: Adopted as standard method, used until 1987, and in altered form through 1997
Lorillard Tobacco Company (LTC): Used internally by Ihrig, others 1969–1973
Linder and Frank (1984)Puff-by-puff measure of smoke pH using PM collected on Cambridge padBWTC: “this work was reported in a little-known file note” in 1984
“Philip Morris” method (1970)Whole smoke measure, no puff profilePhilip Morris (PMTC): Standard method, at least as early as 1970
Lakritz (1975)Measure of both whole smoke and vapour phase using platinum-sliver, silver chloride electrodeLTC: Internal method
Harris and Hayes (1977)Whole smoke measure using pH electrode, modifying Sensabaugh method (with no puff profile)BWTC: Used experimentally in 1990
ISFET whole smoke method (1997)Whole smoke measure, modifying Harris-Hayes method with use of solid-state probes (not glass electrode)BWTC: Adopted in 1997