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Morlier LW, Tomkins DF, Koppen B, Declercq B, Weller O, Gregoric A, Focht C, Roberts G, Harbin D, Schreuder RH, Hicks H, Verbist F, Wieland T, Bjorholm T, Manso L, Cohen S, Lee E, Zurcher T, Muller MD, Tomkins DF, Noble A, Schlesinger HD, Smallage B, Tarn KC, Kim YW, Sato T, Schultz DI, Parsons A, Galoux IM, Hussain M, Masollerx FME. Liquid Chromatographic Determination of Glyphosate in Water-Soluble Granular Formulations: Collaborative Study. J AOAC Int 2020. [DOI: 10.1093/jaoac/80.3.464] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [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 liquid chromatographic (LC) method for the determination of glyphosate in various water-soluble granular formulations was tested by 28 laboratories. Samples were dissolved in mobile phase and injected directly into an LC system with a 25 cm SAX column and a mobile phase of 96% aqueous buffer solution, 0.0062M KH2PO4, and 4% methanol. Detection was by UV absorption at 195 nm. Manual or automated injections were made via fixed-volume loops. Calculations were based on peak area comparisons with external standards. The collaborative study analyzed 5 matched pairs of 4 water-soluble granular formulations, with one determination per sample. The study generated 138 matched pairs, which were analyzed by using the AOAC spreadsheet and Youden’s matched-pair calculations. Coefficients of variation for the 4 formulations ranged from 0.65 to 1.37%. The LC method for the determination of glyphosate in water-soluble granular formulations has been adopted first action by AOAC INTERNATIONAL.
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