1,721,146 research outputs found
Prediction of Surface Water Input of Chloridazon and Chlorpyrifos from an Agricultural Watershed in Chile
No full textPrediction of surface water input of chloridazon and chlorpyrifos from an agricultural watershed in Chile
No full textTwo compartmental fugacity-based models (Agrifug and SoilFug) for the prediction of pesticide runoff from agricultural fields were applied and experimentally validated in a river watershed, of about 106 km(2), in central Chile. Chloridazon and chlorpyrifos, two of the most widely used pesticides in the study area, were selected for their different physico-chemical properties, in order to test a range of environmental fate patterns by means of these models. Theoretical values were compared with analytical determinations in river water and soil and a goad predictive capability was found for both models, at least at the order of magnitude level. Value and limitations of the application of this approach at the basin scale and its usefulness for the management of pesticides are discussed
Losses of terbuthylazine and alachlor from agricultural fields - Part I: Volatilization processes
No full textQSAR and chemometric approaches for setting water quality objectives for dangerous chemicals
No full textAgronomic and ecotoxicological aspects of herbicide contamination of groundwater in Italy
No full textPesticides risk assessment in a lagoon ecosystem.Part II: effect assessment and risk characterization
No full textEcotoxicological risk assessment for pesticides was performed on a coastal lagoon ecosystem (Orbetello lagoon, central Italy) according to the procedure described in the European technical guidance document (TGD) on risk assessment for new and existing substances. The procedure was applied to individual chemicals and to a mixture of chemicals with the same toxicological mode of action. Biomarker studies, measuring acetylcholinesterase (AchE) activity inhibition, were conducted on Zosterisessor ophiocephalus to compare the results of theoretical risk assessment with experimental measurements of ecotoxicological stress. Value and limitations of the risk assessment procedure and its application to site-specific environmental conditions are discussed. A tool crop risk index (CRI) for assessing the overall impact of pesticide use on a crop is proposed
Modeling and Prediction by using WHIM descriptors in QSAR studies: toxicity of heterogeneous chemicals on Daphnia magna
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