Adsorption of halothane vapour in glass syringes.

THE ~-'v~OST COM~ON too1 in medical research is the glass syringe. It is often employed for the sampling of various gases, vapours, and their mixtures, During our experiments regarding reproducibility of anaesthetic vapour-gas mixtures, we found that the results depended considerably upon the time the mixture remained in the syringe before analysis. After considering and eliminating other possible causes, it seemed the adsorption on the ground glass wall was responsible. The adsorption in the syringe occurred when it contained an anaesthetic vapour, not pure air or other gases, For our study we used halothane vapour-air mixtures.