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Sorption kinetics of chlorinated hydrophobic organic chemicals
Authors:S Marca Schrap  Gerard L G Sleijpen  Willem Seinen  Antoon Opperhuizen
Institution:1. Research Institute of Toxicology, Environmental Chemistry Group, University of Utrecht, P.O. Box 80.058, 3508, TB Utrecht, The Netherlands
2. Department of Mathematics, University of Utrecht, P.O. Box 80.010, 3508, TA Utrecht, The Netherlands
3. Public Works and Water Management, Tidal Waters Division, P.O. Box 20.907, 2500, EX The Hague, The Netherlands
Abstract:This is the second of a two-part series describing the sorption kinetics of hydrophobic organic chemicals. Part I “The Use of First-Order Kinetic Multi-Compartment Models” is published in issue 1 of this journal, pp. 21–28. Sorption kinetics of chlorinated benzenes from a natural lake sediment have been investigated in gas-purge desorption experiments. Biphasic desorption curves, with an initial “fast” part and a subsequent “slow” part, were found for all tested chlorobenzenes. From these results first-order sorption uptake and desorption rate constants were calculated with a two-sediment compartment model, which is presented in the first paper. In three sets of experiments the sorption uptake period and sediment/water ratio were varied. Rate constants are not influenced by these experimental conditions, which supports the partitioning concept for the sorption of hydrophobic organic chemicals in sediments.
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