Abstract

Abstract Environmental assessment methodologies and studies of element cycling in ecosystems require a quantitative description of each transfer process contributing to the mobility of the entity (or element) under scrutiny. A conceptually simple filtration model is put forward as a candidate description of such a transfer process, appropriate when mobility is impeded by continual capture and release (possibly only partial release) by an interacting medium through which the entity passes. Three variants of the model are described, according to the saturability of the interacting medium and of the mobile host. Their presentation should make them particularly amenable to descriptions of a wide variety of processes which may be perceived in terms of filtration or exchange.

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