Abstract
A method to determine the fugacity of semivolatile organochlorine compounds on solid surfaces is presented. The method was developed and tested using spruce needles. Needle surface fugacities were determined indirectly, using the concentration of the compound in a gas phase which had been equilibrated with the needle surface. Measurements with both artificially contaminated and natural spruce needles showed good agreement between the fugacities on the needle surfaces and the air fugacities of the chosen compounds in the needles'habitat.
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