Simultaneous determination of linuron and trifluralin residues in carrots and their pulp by liquid chromatography and gas chromatography.
A simple method is described for determining trifluralin and linuron in carrots and their pulp. Samples are extracted with hexane-ethyl ether (1 + 1), cleaned up with a disposable Florisil cartridge, and eluted first with hexane-ethyl ether (99 + 1) (for trifluralin), and then with hexane-ethyl ether (3 + 7) (for linuron). Trifluralin is then analyzed by electron capture gas chromatography (GC/ECD), and linuron by GC/ECD and liquid chromatography with ultraviolet detection (LC/UV). Recoveries were determined by spiking untreated carrot and carrot pulp homogenates with trifluralin and linuron at 0.04, 0.16, and 0.32 micrograms/g. Six determinations were performed at each level for both compounds. GC/ECD average recoveries were 87.1% for trifluralin and 93.6% for linuron in carrots and 89.9% for trifluralin and 94.2% for linuron in carrot pulp. LC/UV recoveries for linuron were 91.5% for carrots and 92.8% for carrot pulp.
D'Amato
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A
Dipartimento di Scienza e Tecnologia del Farmaco, Torino, Italy.
Semeraro
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I
Bicchi
C
C
D002849:Chromatography, Gas; D002853:Chromatography, Liquid; D007202:Indicators and Reagents; D008044:Linuron / Q000032:analysis*; D010573:Pesticide Residues / Q000032:analysis*; D012997:Solvents; D013056:Spectrophotometry, Ultraviolet; D014274:Trifluralin / Q000032:analysis*; D014675:Vegetables / Q000737:chemistry*
D007202:Indicators and Reagents; D010573:Pesticide Residues; D012997:Solvents; D008044:Linuron; D014274:Trifluralin