Document Detail


Rapid changes in PCB and OC pesticide concentrations in arctic snow.
MedLine Citation:
PMID:  15926544     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The short-term fate of polychlorinated biphenyl (PCB) and organochlorine (OC) pesticides in the surface snowpack was investigated by taking consecutive air and snow samples over a 12 day period at Tromsø in the Norwegian Arctic. A wide range in PCB and OC pesticide concentrations was observed in snow and was attributed to the systematic decrease in concentrations that occurred over the study period. For example, sigmaPCB concentrations ranged from 2500 to 300 pg L(-1) (meltwater) with a rapid decrease observed during the first 96 h. Rates of decline (ks) conformed to first-order kinetics, with similar rates observed for all compounds measured in this study (k5 = 0.01 +/- 0.001 h(-1)). Because the particle bound fraction accounted for <10% of the individual PCB and OC burden in the snow, then the fraction lost may be accounted for by desorption, following notable increases in snow density (and presumably, decreases in snow surface area). The fraction of chemical present in the fresh snow (phis) was found to be exponentially related to changes in snow density (deltarho). Relatively small increases in p following snowfall result in a large loss of sorbed chemical, presumably due to decreases in snow surface area. Later sampling of the same snow layer, but buried under fresh snowfall, revealed a notable increase in both PCB and OC concentrations. This would indicate a possible downward migration of these chemicals from the fresh snow into deeper snow layers, suggesting that re-emission of desorbed chemical from the interstitial pore spaces to the overlying atmosphere may be complicated by this process.
Authors:
B M J Herbert; C J Halsall; S Villa; K C Jones; R Kallenborn
Related Documents :
15092414 - Concentrations of two organic contaminants in precipitation, soils and plants in the es...
20204344 - Properties of blood, porphyrins, and exposure to legacy and emerging persistent organic...
20176134 - Differential sensitivity of cyp1a to 3,3',4',4-tetrachlorobiphenyl and benzo(a)pyrene i...
18350874 - Identification of ah receptor agonists in soil of e-waste recycling sites from taizhou ...
15928624 - Green tea and the skin.
22699354 - Membrane bioreactor (mbr) sludge inoculation in a hybrid process scheme concept to assi...
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Environmental science & technology     Volume:  39     ISSN:  0013-936X     ISO Abbreviation:  Environ. Sci. Technol.     Publication Date:  2005 May 
Date Detail:
Created Date:  2005-06-01     Completed Date:  2005-08-10     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0213155     Medline TA:  Environ Sci Technol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  2998-3005     Citation Subset:  IM    
Affiliation:
Environmental Science Department, Lancaster University, Lancaster LA1 4YQ, UK.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Descriptor/Qualifier:
Arctic Regions
Environmental Monitoring
Environmental Pollutants / analysis*
Pesticides / analysis*
Polychlorinated Biphenyls / analysis*
Porosity
Snow*
Chemical
Reg. No./Substance:
0/Environmental Pollutants; 0/Pesticides; 0/Polychlorinated Biphenyls

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


Previous Document:  Hydroxylated and methoxylated brominated diphenyl ethers in the red algae Ceramium tenuicorne and bl...
Next Document:  Posidonia oceanica as a historical monitor device of lead concentration in marine environment.