PMID- 15298198
OWN - NLM
STAT- MEDLINE
DCOM- 20040823
LR  - 20190714
IS  - 0013-936X (Print)
IS  - 0013-936X (Linking)
VI  - 38
IP  - 14
DP  - 2004 Jul 15
TI  - Exchange of polychlorinated biphenyls (PCBs) and polychlorinated naphthalenes 
      (PCNs) between air and a mixed pasture sward.
PG  - 3892-900
AB  - To improve understanding of air-to-vegetation transfer of persistent organic 
      pollutants (POPs), uptake and depuration of polychlorinated biphenyls (PCBs) and 
      polychlorinated naphthalenes (PCNs) between grass sward and air was investigated. 
      Pasture swards were placed in fanned (2 m s(-1) wind speed) and unfanned 
      conditions for a period of 20 days and sampled at intervals. Depuration was 
      carried out after a short (4 days) and a long (14 days) exposure period. Prior to 
      contamination, a mixed pasture sward at a semi-rural location contained sigmaPCN 
      concentrations 15-20% of the sigmaPCB concentration. Uptake of both PCBs and PCNs 
      was broadly linear in fanned and unfanned conditions over the 20-day period, 
      i.e., the pasture did not reach equilibrium with the air. Uptake rates (fluxes) 
      were greater under the fanned conditions. The difference in uptake rates between 
      fanned and unfanned conditions increased with degree of chlorination for both 
      PCBs and PCNs, ranging between a factor of 2 for tri-chlorinated PCBs and PCNs 
      and a factor 5 for octa-chlorinated PCBs. Depuration results over the first hours 
      were very scattered, showing an initial period of loss, followed by an increase 
      in concentrations, possibly as a result of re-volatilization of PCBs from the 
      soil in the trays, with consequent recapture by the overlying sward. Rapid 
      clearance was observed over the following days, but depuration of PCBs and PCNs 
      was still incomplete after 14 days, with 20% of the initial concentration of the 
      sigmaPCBs and 10% of the sigmaPCNs retained by the sward. There was no difference 
      in the proportion of POPs retained in the sward between the 4- and 14-day 
      contamination treatments. POP-specific differences in the amount of compound 
      "trapped" in leaves after contamination were observed. The results show that, 
      although changes in the rate of air movement around a pasture have an effect on 
      the uptake rate of POPs into the vegetation, plant-side resistance controls both 
      the air-to-pasture and pasture-to-air exchange of gas-phase PCBs and PCNs; i.e., 
      differences between plant species in cuticle composition and/or structure 
      affecting the permeability of the cuticle are of greater importance than 
      differences in leaf morphology affecting aerodynamic roughness.
FAU - Barber, Jonathan L
AU  - Barber JL
AD  - Department of Environmental, Institute of Environmental and Natural Sciences, 
      Lancaster University, Lancaster, LA1 4YQ, UK. j.l.barber@lancaster.ac.uk
FAU - Thomas, Gareth O
AU  - Thomas GO
FAU - Bailey, Rebekah
AU  - Bailey R
FAU - Kerstiens, Gerhard
AU  - Kerstiens G
FAU - Jones, Kevin C
AU  - Jones KC
LA  - eng
PT  - Journal Article
PT  - Research Support, Non-U.S. Gov't
PL  - United States
TA  - Environ Sci Technol
JT  - Environmental science & technology
JID - 0213155
RN  - 0 (Environmental Pollutants)
RN  - 0 (Hydrocarbons, Chlorinated)
RN  - 0 (Naphthalenes)
RN  - 0 (Soil)
RN  - DFC2HB4I0K (Polychlorinated Biphenyls)
SB  - IM
MH  - Air/*analysis
MH  - Air Movements
MH  - Environmental Pollutants/*analysis
MH  - Hydrocarbons, Chlorinated/*analysis
MH  - Naphthalenes/analysis
MH  - Poaceae/*chemistry
MH  - Polychlorinated Biphenyls/analysis
MH  - Soil/*analysis
EDAT- 2004/08/10 05:00
MHDA- 2004/08/24 05:00
CRDT- 2004/08/10 05:00
PHST- 2004/08/10 05:00 [pubmed]
PHST- 2004/08/24 05:00 [medline]
PHST- 2004/08/10 05:00 [entrez]
AID - 10.1021/es035428n [doi]
PST - ppublish
SO  - Environ Sci Technol. 2004 Jul 15;38(14):3892-900. doi: 10.1021/es035428n.