Silva, Aline S. [UNESP]Toth, Ildiko V.Pezza, Leonardo [UNESP]Pezza, Helena Redigolo [UNESP]Lima, Jose L. F. C.2014-05-202014-05-202011-10-01Analytical Sciences. Tokyo: Japan Soc Analytical Chemistry, v. 27, n. 10, p. 1031-1036, 2011.0910-6340http://hdl.handle.net/11449/26113A simple screening method was developed for the determination of glyphosate in water samples using a multi-pumping flow system. The proposed method is based on the reaction between glyphosate and p-dimethylaminocinnamaldehyde (p-DAC), in an acid medium where the reaction product can be measured spectrophotometrically at lambda(max) = 495 nm. An experimental design methodology was used to optimize the measurement conditions. The proposed method was applied to the determination of glyphosate in water samples in a concentration range from 0.5 to 10 mu g mL(-1). The limit of detection and quantification were 0.17 and 0.53 mu g mL(-1), respectively. The results obtained (88.5 to 104.5%) in recovery studies for the determination of glyphosate in different water samples indicated good accuracy and no matrix effect for the developed method. Samples were also analyzed by a confirmatory HPLC method, and agreement within the two set of results was found.1031-1036engArtigo10.2116/analsci.27.1031WOS:000296315900010Acesso aberto597890859185352431921250983611210000-0003-0197-7369