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Harbtn DN, Amleh A, Bernes A, Bodzian F, Boyer K, Conaway J, Dias H, Dommarco R, Duverney-Pret P, Earnest S, Ely D, Fornarelli L, Förster R, Gentry G, Görlitz G, Gomez F, Guess P, Hähnchen K, Hamilton D, Halley M, Hathaway M, Hickes H, Isono K, Kulinna H, Lucas P, Manger P, Manso L, Moffett S, Müller T, Orii T, Paul R, Reubke K, Rivera L, Rubbiani M, Schetter J, Schulz D, Shaocong L, Smead F, Tam K, Tengler H, Torma L, del Valle M, Verweij A, Walls G, Weiping G. Quantitation of Tebuconazole in Liquid and Solid Formulations by Capillary GC: Collaborative Study. J AOAC Int 2020. [DOI: 10.1093/jaoac/80.4.703] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
Abstract
Abstract
A capillary gas chromatographic method has been developed for quantitation of tebuconazole (Folicur, Elite, Raxil, Lynx) in liquid and solid formulations. Tebuconazole is a broad-spectrum, systemic foliar fungicide used to control diseases of wheat, barley, peanut, and grasses grown for seed. Samples are dissolved in acetone and analyzed by capillary gas chromatography (GC) with dicyclohexyl phthalate as internal standard. Twenty-two laboratories from 11 countries participated in a collaborative study of the method. Each collaborator was provided reference standard, internal standard, and blind duplicate samples from 6 formulations: aqueous flowable (F), aqueous emulsifiable concentrate (EW), emulsifiable concentrate for seed treatment (ES), flowable for seed treatment (FS), wettable powder (WP), and dry flowable (DF). Collaborators were instructed to use peak area measurements for quantitation. The seed treatment flowable formulation required confirmation of accurate integration values by the collaborator. Relative standard deviation values for reproducibility (RSDR) for analysis of the formulations were as follows: 3.6 lb/gal F, 1.22; 250 g/L EW, 1.13; 15 g/L ES, 2.40; 25 g/L FS, 2.65; 25% WP, 0.96; 25% DF, 0.72; 45% DF, 0.72. The capillary GC method for quantitation of tebuconazole in fungicide formulations has been adopted first action by AOAC INTERNATIONAL.
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Affiliation(s)
- Donald N Harbtn
- Bayer Corporation, Agriculture Division, PO Box 4913, 8400 Hawthorne Rd, Kansas City, MO 64120-0013
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