Determination of linuron in potatoes using capillary column gas chromatography/mass spectrometry.

G. C. Mattern, G. M. Singer, J. Louis, M. Robson, J. D. Rosen

Research output: Contribution to journalArticlepeer-review

23 Scopus citations

Abstract

A convenient method for the determination of the N-methyl,N-methoxy-phenylurea herbicide (linuron) in potatoes has been developed. The herbicide is extracted from potatoes using a slightly modified Luke multiresidue procedure. The extract is analyzed directly by gas chromatography with cold on-column injection, using an ion trap mass spectrometer in the chemical ionization mode as the detector. Quantitation is performed using p-bromonitrobenzene as the internal standard. The limit of detection is 0.1 ppm. Recoveries of linuron in potatoes averaged 112 +/- 6% at the 0.5 ppm level, and 110 +/- 2% at the 0.2 ppm level. No linuron residues were found in 25 potato samples that were analyzed by this method. Two other N-methyl,N-methoxy-phenylurea herbicides, metobromuron and chlorbromuron, are also sufficiently stable to be determined by this method, but the N,N-dialkyl-phenylurea herbicides neburon, diuron, and monuron are too thermally unstable and degrade in the gas chromatograph.

Original languageEnglish (US)
Pages (from-to)970-974
Number of pages5
JournalJournal of AOAC International
Volume72
Issue number6
DOIs
StatePublished - 1989

ASJC Scopus subject areas

  • Chemistry(all)

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