Low temperature followed by matrix solid-phase dispersion-sonication procedure for the determination of multiclass pesticides in palm oil using LC-TOF-MS

Sobhanzadeh, E. and Bakar, N.K.A. and Abas, M.R. and Nemati, K. (2011) Low temperature followed by matrix solid-phase dispersion-sonication procedure for the determination of multiclass pesticides in palm oil using LC-TOF-MS. Journal of Hazardous Materials, 186 (2-3). pp. 1308-1313. ISSN 03043894, DOI https://doi.org/10.1016/j.jhazmat.2010.12.001.

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A simple and effective multiresidue method based on precipitation at low temperature followed by matrix solid-phase dispersion-sonication was developed and validated to determine dimethoate, malathion, carbaryl, simazine, terbuthylazine, atrazine and diuron in palm oil using liquid chromatography time-of-flight mass spectrometry (LC-TOF-MS). Liquid-liquid extraction (LLE) followed by low temperature method were optimized by studying the effect of type and volume of organic solvent (acetonitrile, acetonitrile:n-hexane (3:2 v/v) and acetone) and time of freezing to obtain high recovery yield and low co-extract fat residue in the final extract. The optimal conditions for matrix solid-phase dispersion (MSPD) were obtained using 5g of palm oil, 2g of primary secondary amine (PSA) as dispersing sorbent, 1g of graphitized carbon black (GCB) as clean-up sorbent and 15mL of acetonitrile as eluting solvent under conditions of 15min ultrasonication at room temperature. Method validation was performed in order to study sensitivity, linearity, precision, and accuracy. Average recoveries at three concentration levels (25, 50 and 100μgkg-1) were found in the range of 72.6-91.3 with relative standard deviations between 5.3 and 14.2. Detection and quantification limits ranged from 1.5 to 5μgkg-1and from 2.5 to 9μgkg-1, respectively.

Item Type: Article
Uncontrolled Keywords: LC/QTOF-MS Matrix solid-phase dispersion Multiclass pesticides Palm oil Atrazines Average recovery Carbaryl Clean-up sorbents Concentration levels Detection and quantification limit Dimethoate Graphitized carbon black Liquid-liquid extraction Low temperature method Low temperatures matrix Method validations Multi-class Multiresidue method N-Hexane Optimal conditions Recovery yield Relative standard deviations Room temperature Secondary amines Simazine Solid phase dispersion Terbuthylazine Time of flight mass spectrometry Ultra-sonication Acetone Acetonitrile Agricultural chemicals Carbon black Dispersions Herbicides Hexane Inductively coupled plasma Liquid chromatography Liquids Mass spectrometry Optimization Organic solvents Recovery Solvent extraction Sorption Urea Vegetable oils Matrix solid phase dispersion amine atrazine carbaril diuron malathion pesticide residue terbutylazine alkane dispersion extraction method herbicide low temperature precipitation (chemistry) solid vegetable oil accuracy analytic method article chemical analysis freezing liquid liquid extraction low temperature procedures sensitivity analysis Adsorption Amines Chromatography, High Pressure Liquid Graphite Pesticides Plant Oils Solid Phase Extraction Temperature Ultrasonics
Subjects: Q Science > QD Chemistry
Divisions: Faculty of Science > Department of Chemistry
Depositing User: miss munirah saadom
Date Deposited: 02 Jul 2013 01:55
Last Modified: 23 Sep 2013 02:30
URI: http://eprints.um.edu.my/id/eprint/6256

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