Soil column experiments used as a means to assess transport, sorption, and biodegradation of pesticides in groundwater.
J Environ Sci Health B
; 43(8): 732-41, 2008 Nov.
Article
em En
| MEDLINE
| ID: mdl-18941999
ABSTRACT
Soil column experiments are used to investigate the fate of three pesticides of high, intermediate, and low solubility in groundwater N- phosphonomethyl glycine (glyphosate); O,O-diethyl-S-[(ethylthio)methyl]phosphorodithioate (phorate); (2,4-dichlorophenoxy)acetic acid (2,4-D). Feed solutions are prepared by adding each pesticide (100 mg/L glyphosate, 50 micro g/L phorate, 50 mg/L 2,4-D) along with conservative tracer, KBr, in synthetic groundwater. The concentration of the pesticides in effluents is detected by ion chromatography (glyphosate, 2,4-D) and GC-FID (phorate). The Br(-) breakthrough curves are employed to estimate the dispersion coefficient and mean pore velocity in each column. Solute transport and reactive models accounting for equilibrium/non-equilibrium sorption and biodegradation are coupled with inverse modeling numerical codes to estimate the kinetic parameters for all pesticides.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Praguicidas
/
Solubilidade
/
Poluentes Químicos da Água
/
Adsorção
Idioma:
En
Revista:
J Environ Sci Health B
Ano de publicação:
2008
Tipo de documento:
Article