Persistence and changes in bioavailability of dieldrin, DDE, and heptachlor epoxide in earthworms over 45 years.
Ambio
; 42(1): 83-9, 2013 Feb.
Article
em En
| MEDLINE
| ID: mdl-23001942
ABSTRACT
The finding of dieldrin (88 ng/g), DDE (52 ng/g), and heptachlor epoxide (19 ng/g) in earthworms from experimental plots after a single moderate application (9 kg/ha) 45 years earlier attests to the remarkable persistence of these compounds in soil and their continued uptake by soil organisms. Half-lives (with 95 % confidence intervals) in earthworms, estimated from exponential decay equations, were as follows dieldrin 4.9 (4.3-5.7) years, DDE 5.3 (4.7-6.1) years, and heptachlor epoxide 4.3 (3.8-4.9) years. These half-lives were not significantly different from those estimated after 20 years. Concentration factors (dry weight earthworm tissue/dry weight soil) were initially high and decreased mainly during the first 11 years after application. By the end of the study, average concentration factors were 1.5 (dieldrin), 4.0 (DDE), and 1.8 (heptachlor epoxide), respectively.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Oligoquetos
/
Praguicidas
/
Diclorodifenil Dicloroetileno
/
Dieldrin
/
Heptacloro Epóxido
Limite:
Animals
Idioma:
En
Revista:
Ambio
Ano de publicação:
2013
Tipo de documento:
Article
País de afiliação:
Estados Unidos