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D'Amato, A. et al.

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.[1]

References

Simultaneous determination of linuron and trifluralin residues in carrots and their pulp by liquid chromatography and gas chromatography. D'Amato, A., Semeraro, I., Bicchi, C. Journal of AOAC International. (1993) [Pubmed]

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