Changes in herbicide concentrations in Midwestern streams in relation to changes in use, 1989-1998.
Sci Total Environ
; 248(2-3): 255-63, 2000 Apr 05.
Article
en En
| MEDLINE
| ID: mdl-10805244
ABSTRACT
Water samples were collected from Midwestern streams in 1994-1995 and 1998 as part of a study to help determine if changes in herbicide use resulted in changes in herbicide concentrations since a previous reconnaissance study in 1989-1990. Sites were sampled during the first significant runoff period after the application of pre-emergent herbicides in 1989-1990, 1994-1995, and 1998. Samples were analyzed for selected herbicides, two atrazine metabolites, three cyanazine metabolites, and one alachlor metabolite. In the Midwestern USA, alachlor use was much greater in 1989 than in 1995, whereas acetochlor was not used in 1989 but was commonly used in 1995. The use of atrazine, cyanazine, and metolachlor was approximately the same in 1989 and 1995. The median concentrations of atrazine, alachlor, cyanazine, and metolachlor were substantially higher in 1989-1990 than in 1994-1995 or 1998. The median acetochlor concentration was higher in 1998 than in 1994 or 1995.
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Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Contaminantes Químicos del Agua
/
Agua Dulce
/
Herbicidas
Tipo de estudio:
Observational_studies
País/Región como asunto:
America do norte
Idioma:
En
Revista:
Sci Total Environ
Año:
2000
Tipo del documento:
Article
País de afiliación:
Estados Unidos