Historical and post-ban releases of organochlorine pesticides recorded in sediment deposits in an agricultural watershed, France
نویسندگان
چکیده
Agricultural use of organochlorine pesticides (OCPs) increased during the twentieth century but many them have been progressively banned several decades after their introduction. Nevertheless, these lipophilic chemical compounds may persist in soils and sediments. From sediment deposits, it is possible to reconstruct chronology OCP releases relation former applications through time. long-term fate OCPs i.e. source, transfer, storage watershed, also related OCPs-sediment characteristics interactions, our study showed significant links between labile or refractory organic matter. cores collected a mainly agricultural Eure River watershed (France), aldrin lindane widespread 1950s–1970s recorded. While declined that date, according temporal trend stable isomer hexachlorocyclohexane (β-HCH), α-, γ-HCH recorded at levels 2000s, suggesting first local post-ban applications. relationships matter resulted an overestimation releases. Also, detection metabolites dichlorodiphenyltrichloroethane (DDT) (i.e. 4,4′-DDE) heptachlor epoxide) ban, revealed role old deep erosion thus reemergence transformation products from historical OCPs.
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ژورنال
عنوان ژورنال: Environmental Pollution
سال: 2021
ISSN: ['1873-6424', '0269-7491']
DOI: https://doi.org/10.1016/j.envpol.2021.117769