Simultaneous determination of 118 pesticide residues in Chinese teas by gas chromatography-mass spectrometry
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Xin Yang
,
De Xu
Abstract
An efficient and sensitive method for simultaneous determination of 118 pesticide residues in teas has been established and validated. A multi-residue analysis of pesticides in tea involved extraction with ethyl acetate-hexane, clean-up using gel permeation chromatography (GPC) and solidphase extraction (SPE), and subsequent identification and quantification of the selected pesticides by gas chromatography-mass spectrometry (GC-MS). For most of the target analytes, optimized pretreatment processes led to no significant interference with analysis of sample matrix, and the determination of 118 compounds was achieved in about 60 min. In the linear range of each pesticide, the correlation coefficient was R 2 ≥ 0.99. At the low, medium and high three fortification levels of 0.05–2.5 mg kg−1, 118 pesticides average recoveries range from 61 % to 121 % and relative standard deviations (RSD) were in the range of 0.6–9.2 % for all analytes. The limits of detection for the method were 0.00030-0.36 mg kg−1, depending on each pesticide.
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© 2008 Institute of Chemistry, Slovak Academy of Sciences
Artikel in diesem Heft
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Artikel in diesem Heft
- Polymer interfaces used in electrochemical DNA-based biosensors
- Integration of biomass drying with combustion/gasification technologies and minimization of emissions of organic compounds
- Application of hydrocolloids as baking improvers
- Simultaneous determination of 118 pesticide residues in Chinese teas by gas chromatography-mass spectrometry
- Modifications of spectrophotometric methods for total phosphorus determination in meat samples
- Modification and characterization of montmorillonite fillers used in composites with vulcanized natural rubber
- A new approach to nickel electrolytic colouring of anodised aluminium
- Solvent-free synthesis and properties of carboxymethyl starch fatty acid ester derivatives
- Reduction of silver nitrate by polyaniline nanotubes to produce silver-polyaniline composites
- Chemometrical analysis of computed QSAR parameters and their use in biological activity prediction
- Mild and efficient conversion of trifluoromethylarenes into tribromomethylarenes using boron tribromide
- 1,3-Dibromo-5,5-dimethylhydantoin as a useful reagent for efficient synthesis of 3,4-dihydropyrimidin-2-(1H)-ones under solvent-free conditions
- A new xanthone from the roots of Securidaca inappendiculata
