Comparison of pesticides levels in grape skin and in the whole grape by a new liquid chromatographic multiresidue methodology

Teixeira, M. J.

doi:10.1016/s0003-2670(03)01573-3

Cited by 2 publications

(2 citation statements)

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“…Chlorpyrifos is not a systemic insecticide [1], however it has a high Kow/Koc and would have been strongly bound to the cuticles of the leaves, so there would have been very little wash-off. This is in line with studies by Teixerira et al [47] and Buschhaus et al [48] on the composition of the epicuticular composition of leaves and their water barrier action as well as the mobility of pesticides in the plant where lipophilicity and concentration of the active ingredient are the driving forces in the transfer. Adjuvants in commercial formulations may also regulate the transfer processes.…”

Section: Diazinonsupporting

confidence: 92%

“…Dimethoate has a low Kow/Koc and hence the wash-off was effective -especially when hot water was used. The dissipation of dimethoate in time, and especially the persistent portion, may be explained by translocation of the residues into other plant compartments, since it is classified as a systemic pesticide [47]. This is also in line with studies by Cabras et al [50], where he showed that dimethoate degraded rapidly during the first week after pesticide application but remained constant in the following two weeks.…”

Section: Diazinonsupporting

confidence: 77%

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Required Withholding Period for Vine Leaves Following Spraying with Pesticide

Maestroni¹,

Ghanem²,

Correll³

et al. 2018

JHER

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Vine leaves are consumed in many countries but little attention is paid to the residues left on them after the application of pesticides that help prevent pests and protect the grapes, the economically important target. Therefore, it is of outmost importance to study the dissipation of the pesticides applied to this crop to protect the consumers that also eat vine leaves. Dissipation kinetics of chlorpyrifos, chlorpyrifos-methyl, diazinon and dimethoate residues were studied in vine leaves grown under sunny conditions in Syria, using an ethyl acetate based sample preparation followed by GC-MS/MS determination. The dissipation rate for all doses applied followed first-order kinetics, with half-lives in grape leaves in the range of 2.9 -3.9 days. At the recommended application dose, a withholding period of 8.9-37.1 days before consumption should be applied to meet current MRLs and minimise risks to consumers. The effectiveness in the reduction of pesticide loads in vine leaves through washing with either cold or hot water was dependant on the physicochemical properties of the studied pesticides. Hot water washing was very effective for dimethoate, a polar and water-soluble pesticide, with an effective reduction of 92% of the residue level; but no significant effect was observed for chlorpyrifos, the most apolar compound in this study.

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Section: Diazinonsupporting

confidence: 92%

Section: Diazinonsupporting

confidence: 77%