Pesticide levels in surface waters in an agricultural-forestry basin in Southern Chile

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dc.contributor.authorPalma, G.
dc.contributor.authorSánchez, A.
dc.contributor.authorOlave, Y.
dc.contributor.authorEncina Montoya, Francisco
dc.contributor.authorPalma, R.
dc.contributor.authorBarra, R.
dc.date2004
dc.date.accessioned2012-02-28T02:49:48Z
dc.date.available2012-02-28T02:49:48Z
dc.date.issued2012-02-27
dc.description.abstractResidues of five pesticides in surface water were surveyed during 2001 and 2003 in the Traiguén river basin in Southern Chile. Simazine, hexazinone, 2,4-D, picloram herbicides and carbendazim fungicide were selected through a pesticide risk classification index. Six sampling stations along the river were set up based on agricultural and forestry land use. The water sampling was carried out before and after the pesticide application periods and in correspondence to some rain events. Pesticides were analyzed by HPLC with DAD detection in a multiresidue analysis. During 2001, in the first sampling campaign (March), the highest concentrations of pesticides were 3.0 μg l -1 for simazine and hexazinone and 1.8 μg l-1 for carbendazim. In the second sampling (September), the highest concentration were 9.7 μg l-1 for 2,4-D, 0.3 μg l-1 for picloram and 0.4 μg l-1 for carbendazim. In the last sampling period (December), samples indicated contamination with carbendazim fungicide at levels of up to 1.2 μg l-1. In sampling carried out on May 2003, no pesticides were detected. In October 2003, the highest concentrations of pesticides were 4.5 μg l-1 for carbendazim and 2.9 μg l -1 for 2,4-D. Data are discussed in function of land use and application periods of the products, showing a clear seasonal pattern pollution in the Traiguén river. Risk assessment for these pesticides was calculated by using a risk quotient (RQ = PNEC/PEC). For picloram the calculated RQ < was 0, which indicates that no adverse effects may occur due to the exposure to this herbicide in the Traiguén river basin. For 2,4-D, simazine, hexazinone, carbendazim RQ > 1, meaning that adverse effects could occur and it is necessary to reduce pesticide exposure in surface waters. It is recommended to continue with a pesticide monitoring program and the implementation of ecotoxicological testing with local and standardized species in order to consider the probability of effects occurrence, with less uncertainty. Thus, it will be more feasible to make some recommendations to regulatory agencies regarding the pesticide use.es
dc.formatPDFes
dc.identifier.citationChemosphere, Vol.57, N°8, 763-770, 2004es
dc.identifier.doi10.1016/j.chemosphere.2004.08.047es
dc.identifier.urihttps://repositoriodigital.uct.cl/handle/10925/789
dc.language.isoenes
dc.sourceChemospherees
dc.subjectPesticidases
dc.subjectPoluciónes
dc.subjectIndice de clasificación de riesgoses
dc.subjectFungicidases
dc.subjectHerbicidaes
dc.subjectCalidad del aguaes
dc.subjectContaminación del aguaes
dc.titlePesticide levels in surface waters in an agricultural-forestry basin in Southern Chilees
dc.typeArtículo de Revistaes
uct.carreraAgronomíaes
uct.carreraIngeniería Civil Ambientales
uct.carreraIngeniería en Acuiculturaes
uct.carreraIngeniería en Recursos Naturales Renovableses
uct.catalogadorjmges
uct.comunidadRecursos Naturaleses
uct.facultadFacultad de Recursos Naturaleses
uct.indizacionISIes
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