Trifluoroanilide derivatization method for the gas chromatographic determination of propionic acid herbicides in water

✍ Scribed by Hideaki Ozawa; Tadashi Tsukioka

• Publisher: Elsevier Science
• Year: 1992
• Tongue: English
• Weight: 476 KB
• Volume: 267
• Category: Article
• ISSN: 0003-2670
• DOI: 10.1016/0003-2670(92)85002-n

✦ Synopsis

Propionic acid herbicides, tetraplon and dalapon, m aqueous solution could be extracted mto an orgamc phase as then tnfluoroamhde derrvatlves formed by reactlon with dlcyclohexylcarbodmmde and tnfluoroamhne at room temperature This direct denvatlzatlon reaction was applied to the mlcrodetermmatlon of these herbicides m water The denvatlves extracted were determmed by gas chromatography wth electron-capture detection (GC-ECD) or by gas chromatography-mass spectrometly (GC-MS) wth selected ion momtormg The detection llrmts of tetraplon and dalapon with a 50-ml water sample were 0 5 and 2 pg l-', respetively, by GC-ECD and for both 0 1 pg 1-l by GC-MS Their recovenes from spiked natural water were more than 70% at concentrations of 2-20 pg I-' The proposed method was applied to the analysis of nver water Keywords Gas chromatography, Gas chromatography-mass spectrometry, Sample preparation, Dalapon, Herbicides, Tetraplon, Waters Tetraplon (sodium 2,2,3,3-tetrafluoroproplonate, TF'P-Na) and dalapon (2,Zdlchloroproplomc acid, DCPA) are herbicides used for the control of grammeous plants They are mamly used m forestry, orchards and/or non-farmmg fields, the former exerting its effect for 2-3 months and the latter for 20-40 days [ll They are halogenated derlvatlves of proplomc acid or the salt, whrch have high water solublllty and relatively high moblhty m sod [ll, and hence are hkely to cause water environment pollution

The determmatron of these herblcldes has been based on ion-exchange chromatography

[2] or ion-pair hquld chromatography

[3] for DCPA products and thin-layer chromatography [4] for