PMID- 12188344
OWN - NLM
STAT- MEDLINE
DCOM- 20030108
LR  - 20190714
IS  - 0013-936X (Print)
IS  - 0013-936X (Linking)
VI  - 36
IP  - 15
DP  - 2002 Aug 1
TI  - Air-side and plant-side resistances influence the uptake of airborne PCBs by 
      evergreen plants.
PG  - 3224-9
AB  - The transfer of persistent organic pollutants (POPs) from airto vegetation is an 
      important air-surface exchange process that affects global cycling and can result 
      in human and wildlife exposure via the terrestrial food chain. To improve 
      understanding of this process, the uptake of gas-phase polychlorinated biphenyls 
      (PCBs) by two slow-growing evergreen shrubs, Skimmia japonicaThunb. and 
      Hebe"Great Orme", was studied to investigate the influence of air-side and 
      plant-side resistances. Uptake of PCBs was monitored over periods of hours, days, 
      and weeks. Uptake rates were higher in the smaller Hebe leaves than the Skimmia 
      leaves. Equilibrium was not attained between air and plants in the duration of 
      the experiments; uptake curves were indicative of a two-phase uptake-step 1 over 
      the order of hours and step 2 continuing steadily over days to weeks. Uptake 
      rates (h(-1)) were greater in conditions simulating typical ambient wind speeds 
      (2 m s(-1)) than under still air, indicating a significant impact of air-side 
      resistance relative to plant-side resistance in still air. Wind speed is an 
      important variable that has not been previously considered in studies of the 
      air-planttransfer of persistent organic pollutants (POPs). Uptake rate constants 
      increased with increasing level of chlorination (and hence K(OA)) both in still 
      air and under turbulent conditions. This was inconsistent with the idea of 
      air-side resistance dominating uptake, since diffusion rates in air decrease with 
      molecular weight (and hence KOA). Greater uptake of particle-bound PCBs may have 
      contributed to this finding, but the most likely explanation is the previously 
      established relationship that the permeability of cuticles increases with 
      increasing KOA of the diffusing chemical. The findings indicate that plant-side 
      resistance can have an important effect on uptake rates of different PCB 
      congeners in the field, even when air-side resistance is high.
FAU - Barber, Jonathan L
AU  - Barber JL
AD  - Department of Environmental Sciences, Institute of Environmental and Natural 
      Sciences, Lancaster University, UK. j.l.barber@lancaster.ac.uk
FAU - Thomas, Gareth O
AU  - Thomas GO
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  - DFC2HB4I0K (Polychlorinated Biphenyls)
SB  - IM
MH  - Air
MH  - Environmental Monitoring
MH  - Environmental Pollutants/*pharmacokinetics
MH  - *Food Chain
MH  - Kinetics
MH  - Magnoliopsida/*physiology
MH  - Particle Size
MH  - Permeability
MH  - Plant Leaves/chemistry
MH  - Polychlorinated Biphenyls/*pharmacokinetics
MH  - Rutaceae/*physiology
EDAT- 2002/08/22 10:00
MHDA- 2003/01/09 04:00
CRDT- 2002/08/22 10:00
PHST- 2002/08/22 10:00 [pubmed]
PHST- 2003/01/09 04:00 [medline]
PHST- 2002/08/22 10:00 [entrez]
AID - 10.1021/es010275u [doi]
PST - ppublish
SO  - Environ Sci Technol. 2002 Aug 1;36(15):3224-9. doi: 10.1021/es010275u.