Lancaster EPrints

Transfers of airborne PCDD/Fs to bulk deposition collectors and herbage.

Jones, Kevin C. and Duarte-Davidson, Raquel (1997) Transfers of airborne PCDD/Fs to bulk deposition collectors and herbage. Environmental Science & Technology, 31 (10). pp. 2937-2943. ISSN 0013-936X

Full text not available from this repository.

Abstract

PCDD/F air concentrations, deposition fluxes, and grass concentrations/offtakes (pg m-2 day-1) were measured concurrently in Bolsover, Derbyshire, England over 1 year during 1992−1993. The data are used here to discuss spatial and temporal differences in atmospheric PCDD/F concentrations and how the airborne PCDD/Fs transferred to the bulk deposition collectors and grass. Three sample sites are discussed, namely, a regional background site (RBS), an urban site (US), and a site close to an industrial complex (IS) that has been a suspected source of selected PCDD/F homologs. Generally, the mixture of PCDD/F 2,3,7,8-substituted congeners and homologs was the same in the air, in the bulk deposition, and in the grass over a given sampling period and site. This suggests that PCDD/Fs of different levels of chlorination were transferring with similar efficiencies from the air to the collectors and grass, despite different gas−particle partitioning in the air. Deposition or transfer velocities for individual congeners/homologs to the bulk collectors throughout the whole study ranged between 0.034 and 0.82 cm s-1 at the sites, averaging 0.27 cm s-1 for PCDD/Fs at the RBS. An experiment conducted to assess potential volatilization of soil-borne PCDD/Fs from contaminated areas near the IS showed that all the compounds had a strong affinity for the soil and that volatilization is not likely to significantly contaminate herbage growing in the contaminated soil or the overlying atmosphere near this site. Herbage PCDD/Fs were therefore derived almost exclusively from the atmosphere in this study. The similarities in the PCDD/F mixture in air and grass suggest that the different PCDD/Fs are scavenged by the grass sward from the atmosphere with similar efficiencies; the implications of this are discussed.

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: 21935
Deposited By: ep_ss_importer
Deposited On: 12 Feb 2009 12:20
Refereed?: Yes
Published?: Published
Last Modified: 26 Jul 2012 15:53
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/21935

Actions (login required)

View Item