Automated multiresidue analysis of pesticides in olive oil by on-line reversed-phase liquid chromatography–gas chromatography using the through oven transfer adsorption–desorption interface

Sánchez, Raquel; Vázquez, Andrés S.; Andini, Juan C.; Villén, Jesús

doi:10.1016/j.chroma.2003.12.018

Cited by 57 publications

(29 citation statements)

References 21 publications

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“…16 Recently, a new method for the direct analysis of pesticide residues in olive oil has been developed. 17,18 Fully automated analyses can be carried out without any kind of sample pretreatment, other than a simple filtration step. This analytical method is here applied to the determination of pesticide residues in olive oil.…”

Section: Introductionmentioning

confidence: 99%

Analysis of pesticide residues by on‐line reversed‐phase liquid chromatography–gas chromatography in the oil from olives grown in an experimental plot

et al. 2005

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This paper describes the use of a fully automated on-line reversed-phase liquid chromatography-gas chromatography (RPLC-GC) method for the determination of four organophosphorus pesticides (dimethoate, methidathion, chlorpyriphos and fenitrothion) in olive oil. These pesticides are among those more extensively used to control pests and disease in olive trees. Various treatments with these pesticides, at various doses and stages of olive ripening, were carried out in an olive grove. The olives were harvested in mid-December and immediately processed into oil in the laboratory. Fully automated analyses by on-line RPLC-GC using the through oven transfer adsorption desorption (TOTAD) interface was carried out without any kind of sample pretreatment other than a simple filtration step. A statistical analysis was performed. No dimethoate remained in the oil owing to the high solubility of dimethoate in water. Differences between the other three pesticide residues were significant. Chlorpyriphos provided the lowest residues, followed by fenitrothion and methidathion.

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Section: Introductionmentioning

confidence: 99%

Analysis of pesticide residues by on‐line reversed‐phase liquid chromatography–gas chromatography in the oil from olives grown in an experimental plot

et al. 2005

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“…[6]. The on-line coupling of reversed-phase liquid chromatography and gas chromatography through oven transfer adsorptiondesorption interface allowed to inject olive oil directly with no sample pre-treatment step other than filtration [7]. In spite of absence of any sample preparation stages, the recoveries of 6 from 8 studied pesticides were lower than 46%.…”

Section: Introductionmentioning

confidence: 99%

An improved extraction method of rapeseed oil sample preparation for the subsequent determination in it of azole class fungicides by gas chromatography

Zayats¹,

Лещев

Zayats

2015

Analytical Chemistry Research

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a b s t r a c tThe distribution of 19 azole class pesticides in hexane/aqueous-organic mixtures systems and rapeseed oil (or oil solution in hexane)/organic solvents has been studied at 20 ± 1°C. The distribution constants (P) and coefficients (D) between hydrocarbon and polar phase are calculated. It is found that all the studied pesticides are hydrophobic, i.e., in hexane-water system log P ) 0. Replacement of water by organic solvents results in sharp log P falling, and their values become negative. It is revealed that solutions of strong inorganic acids in anhydrous acetonitrile extract azole class pesticides from hexane and vegetable oils most fully and selectively. In particular, the acidification of acetonitrile causes a drop of D values in 50-2000 times for the majority of the studied pesticides. This phenomenon was used for the development of the improved technique for the quantitative analysis of a widely used azole class pesticides, which can be presented at trace levels in rapeseed oil. The proposed methodology is based on dissociation extraction (DE) of azoles using perchloric acid in anhydrous acetonitrile, with following clean-up of acetonitrile extract from organic impurities by hexane and aqueous solution of dipotassium hydrogen orthophosphate, and final GC-ECD (gas chromatography with electron capture detection) determination of azole fungicides. The values of obtained recoveries were between 85% and 115% with RSD values below 10%. The obtained limits of quantitation, ranged from 3.0 to 300 lg kg À1 , are below the maximum residue levels (MRLs) set by the European Union for the majority of pesticides. The developed method was successfully applied to different rapeseed oil samples.

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“…In this way, a repeated sampling of slow rate processes taking place within the chromatographic column can be carried out. Using suitable mathematical analysis of the experimentally obtained chromatographic data, a big amount of physicochemical parameters have been estimated among the others: adsorption equilibrium constants, gas diffusion coefficients in binary and ternary mixtures, activity coefficients, mass transfer coefficients on solids and liquids, solubility and interaction parameters in polymer-solvent systems, molecular diameters and critical volumes in gases, Lennard-Jones parameters, as well as rate constants and activation parameters [32][33][34][35][36][37][38][39][40][41][42][43][44][45][46][47][48][49][50][51].…”

Section: Introductionmentioning

confidence: 99%

Determination of Lewis Acid Base Properties of Poly(α-n-alkyl) Methacrylates Adsorbed on Silica by Inverse GC

Hamieh

2011

Chromatographia

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In this paper, the acid base properties in the Lewis terms of poly(a-n-alkyl) methacrylates and when they are adsorbed on silica, were determined. The acid base constants K A and K D of various polymers were calculated by testing the classical model and proposed a new model giving K A and K D and a third constant K reflecting the amphoteric character of our solid substrates and obtaining more precise and quantified results. When the length of alkyl group in side chain of poly(a-n-alkyl) methacrylates changes, the surface properties of such polymers also change and consequently affect all superficial characteristics and especially the acid base constants and the transition phenomena. It was also proved that the specific enthalpy was directly correlated to the acid base constants, the carbon atom number in the side chain of poly(a-n-alkyl) methacrylates and the acceptor AN and donor DN numbers of electrons of polar organic molecules, by the following relationship: DH sp = DH sp (AN, DN, K D , K A , n SC ).

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Automated multiresidue analysis of pesticides in olive oil by on-line reversed-phase liquid chromatography–gas chromatography using the through oven transfer adsorption–desorption interface

Cited by 57 publications

References 21 publications

Analysis of pesticide residues by on‐line reversed‐phase liquid chromatography–gas chromatography in the oil from olives grown in an experimental plot

Analysis of pesticide residues by on‐line reversed‐phase liquid chromatography–gas chromatography in the oil from olives grown in an experimental plot

An improved extraction method of rapeseed oil sample preparation for the subsequent determination in it of azole class fungicides by gas chromatography

Determination of Lewis Acid Base Properties of Poly(α-n-alkyl) Methacrylates Adsorbed on Silica by Inverse GC

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