Sorption of volatile organic chemicals in plant surfaces

被引:49
作者
Welke, B [1 ]
Ettlinger, K [1 ]
Riederer, M [1 ]
机构
[1] Univ Wurzburg, Biozentrum, Lehrstuhl Bot 2, D-97082 Wurzburg, Germany
关键词
D O I
10.1021/es970763v
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Sorption in the cuticles covering most of the above-ground surface of plants is the first step of the atmosphere-to-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 degrees 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 x 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.
引用
收藏
页码:1099 / 1104
页数:6
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