Determination of Glyphosate in Water Samples by Multi-pumping Flow System Coupled to a Liquid Waveguide Capillary Cell

• Type: Article in International Scientific Journal
• Date: 2011

Authors

Silva, AS (Author) Other; Toth, IV (Author) Other; Pezza, L (Author) Other; Pezza, HR (Author) Other; Lima, JLFC (Author) FFUP

Journal

Title: Analytical Sciences

Vol. 27 No. 5

Pages: 1031-1036

ISSN: 0910-6340

Publisher: Japan Society for Analytical Chemistry

Indexing

ISI Web of Knowledge - 6 Citations

Scopus - 6 Citations

Other information

Authenticus ID: P-002-KWV

Abstract (EN): 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 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.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 6