Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 433377
Title Development and independent laboratory validation of a simple method for the determination of paraquat and diquat in potato, cereals and pulses
Author(s) Kolberg, D.I.S.; Mack, D.; Anastassiades, M.; Hetmanski, M.T.; Fussell, R.J.; Meijer, T.; Mol, J.G.J.
Source Analytical and Bioanalytical Chemistry 404 (2012)8. - ISSN 1618-2642 - p. 2465 - 2474.
DOI https://doi.org/10.1007/s00216-012-6340-9
Department(s) BU Microbiological & Chemical Food Analysis
Publication type Refereed Article in a scientific journal
Publication year 2012
Keyword(s) performance liquid-chromatography - dilution mass-spectrometry - electrospray-ionization - chlormequat residues - ion suppression - blood - water - herbicides - injection - pears
Abstract A new sensitive, fast and robust method for the determination of paraquat and diquat residues in potatoes, cereals and pulses is presented. Different extraction conditions (solvent, time and temperature) have been evaluated using barley grain, potatoes and dry lentils containing incurred residues of diquat and paraquat. The finalised procedure involves extraction with a mixture of methanol/water/hydrochloric acid at 80 °C and analysis by liquid chromatography–tandem mass spectrometry. Diquat D4 and Paraquat D6 internal standards were added to the test portions prior to extraction. A small-scale inter-laboratory validation of the developed method for diquat and paraquat using potato and barley samples was conducted by three laboratories. The precision and accuracy of the method were determined from recovery experiments (five replicates) at 0.01 and 0.1 mg¿kg-1. The recoveries obtained (n¿=¿180) were in the range of 92–120 % with associated relative standard deviation (RSD) between 1.4–10 % for all compound/commodity/spiking concentration combinations.
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