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Remediation of fungicide residues on fresh produce by use of gaseous ozone

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dc.contributor.author Walse, S.S.
dc.contributor.author Karaca, H.
dc.date.accessioned 2019-08-16T12:03:13Z
dc.date.available 2019-08-16T12:03:13Z
dc.date.issued 2011
dc.identifier.issn 0013936X (ISSN)
dc.identifier.uri http://acikerisim.pau.edu.tr:8080/xmlui/handle/11499/5923
dc.description.abstract Ozone fumigation was explored as a means for degrading organic fungicide residues on fresh produce. Fungicides sorbed onto model abiotic glass surfaces or onto grape berries were fumigated separately in a flow-through chamber. Gaseous ozone at a constant concentration of 150 ± 10 ppmv (μL•L -1) selectively oxidized fungicides sorbed to model surfaces. Over 140 min, boscalid and iprodione levels did not change significantly based on a single-factor analysis of variance (ANOVA) at the 95% level of confidence (p = 0.05); however, pseudo-first-order losses resulted in observable rate constants of ozonolysis, k ozonolysis (min -1), of 0.0233 ± 0.0029 (t 1/2 ≈ 29.7 min), 0.0168 ± 0.0028 (t 1/2 ≈ 41.3 min), and 0.0127 ± 0.0010 (t 1/2 ≈ 54.6 min) for fenhexamid, cyprodinil, and pyrimethanil, respectively. The relative degradation of fungicides on berries at gaseous ozone concentrations of 900 ± 12 ppmv (μL•L -1) over 2 h was similar to that on glass; decreases in residue concentration were observed for only fenhexamid (∼64%), cyprodinil (∼38%), and pyrimethanil (∼35%) with corresponding k ozonolysis (min -1) of 0.0085 ± 0.0021 (t 1/2 ≈ 81.5 min), 0.0039 ± 0.0008 (t 1/2 ≈ 177.7 min), and 0.0036 ± 0.0007 (t 1/2 ≈ 192.5 min). Heterogeneous rate constants of gaseous ozone reacting with a sorbed fungicide, k O3(M -1•min -1), were calculated for both surfaces and indicate losses proceed ∼15-fold slower on grapes. The kinetics and mechanism of fungicide removal, supported by gas chromatography- and liquid chromatography-mass spectrometry product analyses, is discussed in the context of facilitating compliance with maximum residue level (MRL) tolerances for fresh produce. © 2011 American Chemical Society.
dc.language.iso English
dc.relation.isversionof 10.1021/es2006868
dc.subject Cyprodinil
dc.subject Fenhexamids
dc.subject Flowthrough
dc.subject Fresh produce
dc.subject Gaseous ozone
dc.subject Glass surfaces
dc.subject Grape berry
dc.subject Heterogeneous rate constant
dc.subject Kinetics and mechanism
dc.subject Liquid chromatography-Mass spectrometry
dc.subject Maximum residue levels
dc.subject Model surface
dc.subject Ozone fumigation
dc.subject Ozonolysis
dc.subject Product analysis
dc.subject Pseudo-first-order
dc.subject Pyrimethanil
dc.subject Agricultural chemicals
dc.subject Fruits
dc.subject Fungicides
dc.subject Gas chromatography
dc.subject Glass
dc.subject Liquid chromatography
dc.subject Mass spectrometry
dc.subject Ozone
dc.subject Rate constants
dc.subject Analysis of variance (ANOVA)
dc.subject boscalid
dc.subject cyprodinil
dc.subject fenhexamid
dc.subject fungicide
dc.subject iprodione
dc.subject ozone
dc.subject pesticide residue
dc.subject pyrimethanil
dc.subject unclassified drug
dc.subject air quality
dc.subject atmospheric pollution
dc.subject factor analysis
dc.subject gas chromatography
dc.subject glass
dc.subject liquid chromatography
dc.subject mass spectrometry
dc.subject reaction kinetics
dc.subject variance analysis
dc.subject vine
dc.subject analysis of variance
dc.subject article
dc.subject bioremediation
dc.subject concentration (parameters)
dc.subject controlled study
dc.subject crop
dc.subject fumigation
dc.subject grape
dc.subject nonhuman
dc.subject oxidation
dc.subject ozonolysis
dc.subject California
dc.subject Environmental Remediation
dc.subject Fumigation
dc.subject Fungicides, Industrial
dc.subject Gas Chromatography-Mass Spectrometry
dc.subject Kinetics
dc.subject Molecular Weight
dc.subject Oxidants
dc.subject Pesticide Residues
dc.subject Pyrimidines
dc.subject Vitis
dc.subject Vitaceae
dc.title Remediation of fungicide residues on fresh produce by use of gaseous ozone
dc.type Article
dc.relation.journal Environmental Science and Technology
dc.identifier.volume 45
dc.identifier.issue 16
dc.identifier.startpage 6961
dc.identifier.endpage 6969
dc.identifier.index Scopus

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