Abstract
The contact areas (on a molecular scale) between aqueous solutions and leaf surfaces have been measured in order to obtain information on the actual areas effective in cuticular transport. For this purpose, monolayer adsorption of pentaclilorophenol (PCP) was used on leaf surfaces and on artificial surfaces. The adsorption isotherms were analysed according to the Brunauer-Emmett and Teller (BET) formalism leading to BET constants and actual contact areas between the aqueous PCP solution and the surfaces. BET constants ranged from 4 to 11, with an arithmetic mean of 6.5. No relationship was found between the chemical composition of the surface waxes and the BET constants, and there were no significant differences between BET constants measured using isolated waxes or intact leaves
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