PMID- 11351741
OWN - NLM
STAT- MEDLINE
DCOM- 20010531
LR  - 20190714
IS  - 0013-936X (Print)
IS  - 0013-936X (Linking)
VI  - 35
IP  - 3
DP  - 2001 Feb 1
TI  - Development of a methyl bromide collection system for fumigated farmland.
PG  - 636-42
AB  - Recent research has indicated that up to 73% of the methyl bromide (MeBr) applied 
      to agricultural farmland is ultimately emitted to the atmosphere despite the 
      practice of complete coverage of the fields with polyethylene (PE) tarp. To 
      reduce the emission of MeBr, several techniques have been investigated. An 
      alternative that has received little consideration is the collection and recycle 
      or treatment of MeBr emissions. We investigated the potential of using a 
      two-layer tarp system for collecting the MeBr. Laboratory experiments with a 
      small two-layer diffusion reactor were conducted to determine the mass transfer 
      coefficient (K) of MeBr through tarps and to validate a model of the collection 
      system. For PE tarps K was 1.15 x 10(-6) m s-1 at 20 degrees C and 5.2 x 10(-6) m 
      s-1 at 60 degrees C. K for so-called virtually impermeable films ranged from 4.6 
      x 10(-10) m s-1 to 1.3 x 10(-8) m s-1. The mathematical model was then used to 
      simulate a full scale fumigant field application. Results indicate excellent 
      agreement between the model, laboratory experiments, and previous field studies. 
      Total emission from the field was a function of the air exchange rate through the 
      swept volume between the two layers, the length of time the field is covered by 
      the collection system, and the mass transfer coefficient of MeBr though the 
      tarps. The results indicate that the proposed two-layer system can be very 
      effective in collecting MeBr emissions from fumigated farmland.
FAU - Chitwood, D E
AU  - Chitwood DE
AD  - Department of Chemical and Environmental Engineering, University of California, 
      Riverside, California 92521.
FAU - Deshusses, M A
AU  - Deshusses MA
LA  - eng
PT  - Journal Article
PL  - United States
TA  - Environ Sci Technol
JT  - Environmental science & technology
JID - 0213155
RN  - 0 (Air Pollutants)
RN  - 0 (Hydrocarbons, Brominated)
RN  - 0 (Insecticides)
RN  - 9V42E1Z7B6 (methyl bromide)
SB  - IM
MH  - Agriculture
MH  - Air Movements
MH  - Air Pollutants/*analysis
MH  - Conservation of Natural Resources
MH  - Environmental Monitoring/*methods
MH  - Hydrocarbons, Brominated/*analysis
MH  - Insecticides/*analysis
MH  - Models, Theoretical
EDAT- 2001/05/16 10:00
MHDA- 2001/06/02 10:01
CRDT- 2001/05/16 10:00
PHST- 2001/05/16 10:00 [pubmed]
PHST- 2001/06/02 10:01 [medline]
PHST- 2001/05/16 10:00 [entrez]
AID - 10.1021/es001440t [doi]
PST - ppublish
SO  - Environ Sci Technol. 2001 Feb 1;35(3):636-42. doi: 10.1021/es001440t.