2018 Collaborative Study for the Determination of Water Activity of Tobacco and Tobacco Products
TTPA Technical Document
In October 2017 the CORESTA Tobacco and Tobacco Products Analytes Sub-Group (TTPA) initiated a proficiency study for the determination of water activity in smokeless tobacco products, ground tobacco, cigarette filler, and cigar filler. The intent of the study was to assess the capability of the participating laboratories to measure water activity and to support laboratory accreditation.
Participating laboratories used water activity meters equipped with one or more of the following sensor types: tunable diode laser (TDL), chilled mirror, or capacitance hygrometer. Water activity measured using a TDL sensor provided consistent results from one lab to another for all products.
Following the TTPA Sub-Group recommendation, a collaborative study was subsequently carried out in 2018 for the determination of water activity in tobacco products where the protocol specified the use of a water activity meter equipped with a TDL sensor. This report outlines the results of the collaborative study, which were used to finalize the CORESTA Recommended Method (CRM) No. 88.