title: Determination of glyphosate in water samples by multi-pumping flow system coupled to a liquid waveguide capillary cell.
abstract: A 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 λ(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 µg mL(-1).  The limit of detection and quantification were 0.17 and 0.53 µg 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.
authors: Instituto de Química, Universidade Estadual Paulista (UNESP), Araraquara, SP, Brazil.
authors: Aline S
authors: AS
authors: Silva
authors: Ildikó V
authors: IV
authors: Tóth
authors: Leonardo
authors: L
authors: Pezza
authors: Helena R
authors: HR
authors: Pezza
authors: José L F C
authors: JL
authors: Lima
mesh_terms: D017022:Flow Injection Analysis / Q000295:instrumentation* / Q000379:methods*; D005618:Fresh Water / Q000737:chemistry*; D005998:Glycine / Q000031:analogs & derivatives* / Q000032:analysis; D013056:Spectrophotometry, Ultraviolet; D014874:Water Pollutants, Chemical / Q000032:analysis*; D000097797:Glyphosate
chemical_list: D005998:Glycine; D014874:Water Pollutants, Chemical; D000097797:Glyphosate