Persistence of 1,2-dibromoethane in soils: entrapment in intraparticle micropores

The soil fumigant 1,2-dibromoethane (EDB) was found in topsoils from agricultural sites up to 19 years after its last known application. The desorption and bioavailability of residual EDB from fumigated soils were compared with added carbon-14 labelled EDB. EDB in fumigated soils was resistant to vo...

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Bibliographic Details
Published in:Environmental science & technology 1987-12, Vol.21 (12), p.1201-1208
Main Authors: Steinberg, Spencer M, Pignatello, Joseph J, Sawhney, Brij L
Format: Article
Language:English
Subjects:
Applied sciences
Biological and physicochemical properties of pollutants. Interaction in the soil
CAPA ARABLE DEL SUELO
CONTAMINACION DEL SUELO
COUCHE ARABLE
DEGRADATION
DETERIORO
ESTERILIZACION DEL SUELO
ETHYLENE DIBROMIDE
Exact sciences and technology
INSECTICIDAS
INSECTICIDE
INSECTICIDES
PERSISTANCE DES PESTICIDES
PERSISTENCIA DE LOS PLAGUICIDAS
PESTICIDE
PESTICIDE PERSISTENCE
PESTICIDES
PLAGUICIDAS
Pollution
POLLUTION DU SOL
RESIDU
RESIDUES
RESIDUOS
Soil and sediments pollution
SOIL POLLUTION
SOIL STERILIZATION
SOIL TEMPERATURE
STERILISATION DU SOL
TEMPERATURA DEL SUELO
TEMPERATURE DU SOL
TOP SOIL
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Summary:The soil fumigant 1,2-dibromoethane (EDB) was found in topsoils from agricultural sites up to 19 years after its last known application. The desorption and bioavailability of residual EDB from fumigated soils were compared with added carbon-14 labelled EDB. EDB in fumigated soils was resistant to volatilization, release into aqueous solution and microbial degradation whereas added EDB was rapidly degraded. EDB release into aqueous solution was highly temperature dependent. A radial diffusion model showed low diffusivities. Residual EDB was probably trapped in soil micropores associated with extreme steric restriction or tortuosity and could not be rapidly dissipated or degraded.
ISSN:0013-936X
1520-5851
DOI:10.1021/es00165a007