This paper describes the development of a new method for monitoring acetic anhydride in the presence of acetic acid in the occupational environment. The method consisted of collecting airborne acetic anhydride on a solid sorbent, desorbing it with acetone and analyzing it by gas chromatography. During the development of this method various parameters such as selection of column, selection of solid sorbent, selection of desorber solvent, effects of humidity, flow rate, total sample volume, desorption efficiency, and shelf-life of samples were studied. Interference from methyl acetate, water, formic acid, and acetic acid was also tested with the determination of acetic anhydride.
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