03145naa a2200397 a 450000100080000000500110000800800410001902200140006002400380007410000170011224501000012926000090022950000740023852019880031265000170230065000170231765300260233465300230236065300120238365300110239565300130240665300140241965300100243365300090244365300090245265300270246165300240248865300110251265300110252370000150253470000160254970000140256570000140257970000140259377301400260710507432019-01-25       2011    bl uuuu     u00u1 u    #d  a0360-12347 a10.1080/03601234.2010.5155042DOI1 aGALIETTA, G.  aPesticide dissipation curves in peach, pear and tomato crops in Uruguay.h[electronic resource]  c2011  aArticle history: Received 02 Jun 2010, Published online: 10 Dec 2010.  aAbstract: Dissipation curves of azoxystrobin and of the neonicotinoids acetamiprid and thiacloprid in peach; azinphos-methyl and carbaryl in pear and azoxystrobin, chlorfenapyr and chlorpyrifos in high-tunnel tomato crops were studied in the Southern region of Uruguay. An analytical methodology based on solid phase extraction (SPE) and detection by High Performance Liquid Chromatography with Diode Array Detector (HPLC/DAD) was used for acetamiprid and thiacloprid. Coupled SPE and detection by Gas Chromatography with Mass Selective Detector (GC/MSD) was used for the detection of azinphos-methyl, azoxystrobin, carbaryl, chlorfenapyr and chlorpyrifos residues. Curves were modeled mathematically with Solver program of Microsoft Excel. The best fit for acetamiprid and thiacloprid in peach was achieved with the exponential model (r(2)=0.961 and 0.944, respectively). In the case of peach fruits there is not a Maximum Residue Limit (MRL) for acetamiprid in the Codex Alimentarius, while 0.5 mg/kg is the value rated for thiacloprid. The MRLs accepted by the European Union (EU) are 0.1 mg/kg for acetamiprid and 0.3 mg/kg for thiacloprid. According to the curves determined in these experiments, thiacloprid residues 10 to 12 days after application (daa) were below the MRLs established by both sources. In the case of acetamiprid, 25 daa would be required, according to the exponential mathematical model, to get residues levels below the MRL values established by the EU. For azinphos methyl in pear, the residues detected were mathematically fitted to an exponential model (r(2)=0.999). According to it, residue levels under the MRL established by the EU (0.05 mg/kg) are gotten in our conditions in 20 daa. In plastic tunnel tomato chlorfenapyr residues were not detected from 16 daa, having the dissipation curve an exponential trend. In the same condition, there was not a decay of the azoxystrobin concentration during a 24-day trial, being it around 0.40 ± 0.05 mg/kg.  aFRUTICULTURA  aHORTICULTURA  aCURVAS DE DISIPACIÓN  aDISSIPATION CURVES  aDURAZNO  aGC/MSD  aHPLC/DAD  aHPLC/PAPA  aPEACH  aPEAR  aPERA  aPESTICIDAS DE RESIDUOS  aRESIDUES PESTICIDES  aTOMATE  aTOMATO1 aEGANA,  E.1 aGEMELLI, F.1 aMAESO, D.1 aCASCO, M.1 aCONDE, P.  tJournal of Environmental Science and Health :part B Pesticides, Food Contaminants, and Agricultural Wastesgv. 46, n.1, p. 35-40, 2011.