title: Screening of currently used pesticides in water, sediments and biota of the Guadalquivir River Basin (Spain).
abstract: The occurrence of 50 currently used pesticides and their transformation products in surface and waste waters, sediment and fish in the Guadalquivir River Basin was determined in 2010 and 2011. After selective sample extraction, pesticides were identified and quantified by liquid chromatography coupled to tandem mass spectrometry (LC-MS/MS). The contamination profile in water and sediments is marked by the presence of organophosphorus and triazines. Transformation products were even at higher concentrations than parent pesticides. A wider range of pesticides was present in water than in sediments but none of them were detected in fish. The mean concentrations ranged from 0.2 to 13.0 ng/L in water and from 0.1 to 13.2 ng/g d.w. in sediment. The spatial distribution of most pesticides was consistent with the agricultural activities of the area or their urban applications. The waste water treatment plant effluents that impact the river are minor sources for few pesticides but for most of them run-off would be the most important contribution. The temporal distribution showed differences between both sampling campaigns related to the river flow. The low-flow produced a pesticide concentration effect, generating higher levels in water and accumulation in sediments. This forecasts a hazard in future scenarios if the current situation of the climate change and water scarcity evolves to more critical conditions highlighting the need of these monitoring studies.
authors.affiliation: Food and Environmental Safety Research Group, Department of Medicine Preventive, Faculty of Pharmacy, University of Valencia, Av. Vicent Andrés Estellés s/n, 46100 Burjassot, Valencia, Spain. Electronic address: Ana.Masia@uv.es.
authors.forename: Ana
authors.initials: A
authors.lastname: Masiá
authors.forename: Julián
authors.initials: J
authors.lastname: Campo
authors.forename: Pablo
authors.initials: P
authors.lastname: Vázquez-Roig
authors.forename: Cristina
authors.initials: C
authors.lastname: Blasco
authors.forename: Yolanda
authors.initials: Y
authors.lastname: Picó
mesh_terms: D000818:Animals; D003530:Cyprinidae; D004784:Environmental Monitoring; D019015:Geologic Sediments / Q000032:analysis; D010573:Pesticide Residues / Q000032:analysis*; D045483:Rivers; D013030:Spain; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D010573:Pesticide Residues; D014874:Water Pollutants, Chemical
keywords: Fish; Pesticides; Sediment; Spatial distribution; Temporal distribution; Water