Sorption in the cuticles covering most of the aboveground surface of plants is the first step of the atmosphereto-vegetation transfer of volatile organic compounds (VOCs). The partitioning of 50 reference VOCs of varying physical-chemical properties between the vapor and the cuticular matrix (MX, obtained by dewaxing isolated cuticles) or aqueous phase, respectively, was studied at 25 °C using static headspace gas chromatography. Linear sorption isotherms were obtained over a wide range of concentrations, indicating that Henry's law applies. Concentration-independent cuticular polymer matrix (MX)/ air (K MXa ), air/water (K aw ), and MX/water (K MXw ) partition coefficients were derived from the slopes of the sorption isotherms. The experimentally determined values of K MXa ranged from 39 (isoprene) to 33 000 (1-hexanol). K MXa s were linearly related to the corresponding partition coefficients for the native cuticular membrane. The values of K aw of the reference compounds varied from 1.94 × 10 -4 (methanol) to 1.66 (limonene). MX/water (K MXw ) partition coefficients ranging from 0.090 (methanol) to 18 094 (limonene) were estimated from K MXa and K aw . For predictive purposes, a set of quantitative property/property and structure/property relationships between K MXa and simple physical-chemical properties and structural descriptors was established.

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ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.