Abstract
The diffusional interactions between a solid body and a fluid of finite extent which is sampled either continuously or intermittently, with or without replacement of the sampled volume, are analysed using perturbation techniques. The perturbation parameter introduced reflects the actual sampling procedure used, and therefore is itself time-dependent. The results are applied to the analysis of recent experimental data on the migration of a phenolic antioxidant from polymer films to aqueous food simulants, and other published data on the extraction of styrene monomer from polystyrene are re-analysed in terms of this model. It is shown that parameter values estimated from batch extraction data can be in significant error if proper account is not taken of the sampling procedure used during the experiments.
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