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 and Technology, 31 (10). pp. 2937-2943. ISSN 0013-936X

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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:
Journal Article
Journal or Publication Title:
Environmental Science and Technology
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/2300/2304
Subjects:
?? environmental chemistrygeneral chemistrychemistry(all)ge environmental sciences ??
ID Code:
21935
Deposited By:
Deposited On:
12 Feb 2009 12:20
Refereed?:
Yes
Published?:
Published
Last Modified:
16 Jul 2024 08:22