Pesticide residue dynamics in passion fruits: Comparing field trial and modelling results

Publication: Research - peer-reviewJournal article – Annual report year: 2012

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  • Author: Juraske, Ronnie, Switzerland

    Institute of Environmental Engineering, ETH Zurich, Switzerland

  • Author: Fantke, Peter

    Institute of Energy Economics and the Rational Use of Energy, University of Stuttgart, Hessbruehlstrasse 49a, 70565 Stuttgart, Germany

  • Author: Ramírez, Ana Cecilia Romero, Colombia

    International Center for Tropical Agriculture (CIAT), Colombia

  • Author: González, Alonso, Colombia

    International Center for Tropical Agriculture (CIAT), Colombia

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We evaluated the exposure to pesticides from the consumption of passion fruits and subsequent human health risks by combining several methods: (i) experimental field studies including the determination of pesticide residues in/on passion fruits, (ii) dynamic plant uptake modelling, and (iii) human health risk assessment concepts. Eight commonly used pesticides were applied onto passion fruits cultivated in Colombia. Pesticide concentrations were measured periodically (between application and harvest) in whole fruits and fruit pulp. Measured concentrations were compared with predicted residues calculated with a dynamic and crop-specific pesticide uptake model, namely dynamiCROP. The model accounts for the time between pesticide application and harvest, the time between harvest and consumption, the amount of spray deposition on plant surfaces, uptake processes, dilution due to crop growth, degradation in plant components, and reduction due to food processing (peeling). Measured and modelled residues correspond well (r2=0.88–0.99), with all predictions falling within the 90% confidence interval of the measured values. A mean error of 43% over all studied pesticides was observed between model estimates and measurements. The fraction of pesticide applied during cultivation that is eventually ingested by humans is on average 10−4–10−6, depending on the time period between application and ingestion and the processing step considered. Model calculations and intake fractions via fruit consumption based on experimental data corresponded well for all pesticides with a deviation of less than a factor of 2. Pesticide residues in fruits measured at recommended harvest dates were all below European Maximum Residue Limits (MRLs) and therefore do not indicate any violation of international regulatory thresholds.
Original languageEnglish
JournalChemosphere
Publication date2012
Volume89
Journal number7
Pages850-855
ISSN0045-6535
DOIs
StatePublished
CitationsWeb of Science® Times Cited: 1
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