Deposition and residues of azoxystrobin and imidacloprid on greenhouse lettuce with implications for human consumption

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

Without internal affiliation

  • Author: Itoiz, Eva Sevigné

    Institute of Agriculture and Food Research and Technology, Spain

  • Author: Fantke, Peter

    Institute of Energy Economics and the Rational Use of Energy (IER), University of Stuttgart, Hessbrühlstr. 49a, 70565 Stuttgart, Germany

  • Author: Juraske, Ronnie

    Institute of Environmental Engineering, Swiss Federal Institute of Technology Zurich, Switzerland

  • Author: Kounina, Anna

    Quantis, EPFL Science Park, Switzerland

  • Author: Vallejo, Assumpció Antón

    Institute of Agriculture and Food Research and Technology, Spain

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Lettuce greenhouse experiments were carried out from March to June 2011 in order to analyze how pesticides behave from the time of application until their intake via human consumption taking into account the primary distribution of pesticides, field dissipation, and post-harvest processing. In addition, experimental conditions were used to evaluate a new dynamic plant uptake model comparing its results with the experimentally derived residues. One application of imidacloprid and two of azoxystrobin were conducted. For evaluating primary pesticide distribution, two approaches based on leaf area index and vegetation cover were used and results were compared with those obtained from a tracer test. High influence of lettuce density, growth stage and type of sprayer was observed in primary distribution showing that low densities or early growth stages implied high losses of pesticides on soil. Washed and unwashed samples of lettuce were taken and analyzed from application to harvest to evaluate removal of pesticides by food processing. Results show that residues found on the Spanish preharvest interval days were in all cases below officially set maximum residue limits, although it was observed that time between application and harvest is as important for residues as application amounts. An overall reduction of 40–60% of pesticides residues was obtained from washing lettuce. Experimentally derived residues were compared with modeled residues and deviate from 1.2 to 1.4 for imidacloprid and azoxystrobin, respectively, presenting good model predictions. Resulting human intake fractions range from 0.045kgintakekgapplied-1 for imidacloprid to 0.14kgintakekgapplied-1 for azoxystrobin.
Original languageEnglish
JournalChemosphere
Publication date2012
Volume89
Issue9
Pages1034-1041
ISSN0045-6535
DOIs
StatePublished
CitationsWeb of Science® Times Cited: 2
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