02349naa a2200325 a 450000100080000000500110000800800410001902200140006002400550007410000220012924501040015126000090025552013440026465000180160865000290162665000410165565000230169665000150171965000150173465000160174965000240176565000240178965000210181365300180183470000250185270000230187770000200190070000210192077300820194121160772019-12-05       2019    bl uuuu     u00u1 u    #d  a1532-41097 ahttps://doi.org/10.1080/03601234.2019.16938352DOI1 aBARIZON, R. R. M.  aPesticides in the surface waters of the Camanducaia River watershed, Brazil.h[electronic resource]  c2019  aAbstract: Camanducaia River is part of the Piracicaba watershed responsible for pumping water into the Cantareira System, which is one of the main water sources for the metropolis of São Paulo and Campinas, Brazil. Intensive use of pesticides and hilly topography represents a situation of high risk for river water contamination. Therefore, water samples from 12 locations were collected along the Camanducaia River and its tributaries, over a period of 4 mo during the rainy season, and analyzed by GC-MS/MS or UPLC- MS/MS for the presence of 46 pesticides. Seven pesticides (fipronil, methyl parathion, metolachlor, atrazine, carbofuran, diuron, and simazine) were positively detected. Only atrazine (the most frequently detected) and diuron were present at concentrations above the limit of quantification of the analytical method (0.32 and 0.57 lg L 1 for atrazine and diuron, respectively). Pesticides detection frequency was higher than expected for a river system where only 11.8% of the land area is under agriculture. The vulnerability of the Camanducaia basin to pesticide contamination is attributed to the high annual precipitation (&gt 1.5 m y 1 in the headwaters), associated with topographical features (steep terrain) and soil types that favor surface runoff, which has been exacerbated by poor soil management practices.  aAgrochemicals  aEnvironmental monitoring  aGas chromatography-mass spectrometry  aPesticide residues  aPesticides  aWatersheds  aAgrotóxico  aBacia Hidrográfica  aPoluição da Água  aResíduo Quimico  aFluvial water1 aFIGUEIREDO, R. de O.1 aSOUZA, D. R. C. de1 aREGITANO, J. B.1 aFERRACINI, V. L.  tJournal of Environmental Science and Health, Part B, New York, p. 1-10, 2019.