Determination of glyphosate in water samples by multi-pumping flow system coupled to a liquid waveguide capillary cell |
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Authors: | Silva Aline S Tóth Ildikó V Pezza Leonardo Pezza Helena R Lima José L F C |
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Institution: | Instituto de Química, Universidade Estadual Paulista (UNESP), Araraquara, SP, Brazil. |
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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. |
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