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Grass-air exchange of polychlorinated biphenyls.

Hung, H. H. and Thomas, Gareth O. and Jones, Kevin C. and Mackay, D. (2001) Grass-air exchange of polychlorinated biphenyls. Environmental Science & Technology, 35 (20). pp. 4066-4073. ISSN 0013-936X

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Abstract

Three field experiments were performed to assess the clearance, uptake, and exchange kinetics of polychlorinated biphenyls (PCBs) between grass and the atmosphere using mixed- and single-species grass (Holcus lanatus). In the clearance experiment, the grass was artificially contaminated by equilibration with diluted Aroclor vapor then exposed to field air, and the rates of depletion were monitored by sampling at regular intervals to determine clearance rate constants. In the uptake experiment, the uptake of PCBs from the ambient atmosphere was followed in growing grass at ambient concentrations for 3 and 6 weeks by analysis of segmented samples along the length of the sward. In the third experiment, diurnal temperature-driven changes in grass concentrations were measured. The results indicate that the grass is behaving as a two-compartment system: (1) a fast-exchanging surface adsorption site with a response time of hours and a capacity essentially independent of KOA, the octanol−air partition coefficient and (2) a slow responding site with a response time of weeks, the capacity of which is related to KOA. The kinetic and equilibrium phenomena involved in grass−air exchange are thus complex and are not adequately described by simple first-order rate constants and equilibrium partitioning coefficients.

Item Type: Article
Journal or Publication Title: Environmental Science & Technology
Subjects: G Geography. Anthropology. Recreation > GE Environmental Sciences
Departments: Faculty of Science and Technology > Lancaster Environment Centre
ID Code: 21548
Deposited By: ep_ss_importer
Deposited On: 21 Jan 2009 13:14
Refereed?: Yes
Published?: Published
Last Modified: 26 Jul 2012 15:48
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/21548

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