A fast and sensitive method was developed for determination of glyphosate, using flow injection analysis. The analyte was converted to a photoactive product that shows maximum absorbance at 405 nm. Beer's law was obeyed over a range of 0.7-20 µg mL -1 . The limit of detection and quantification were found to be 0.20 ± 0.01 and 0.70 ± 0.02 µg mL -1 with a high sample throughput of 60 samples h -1 . The investigation of interference effect shows that among the compounds studied, only aminomethyl

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... hosphonic acid exhibits a signal enhancing effect when present in higher concentration ratio with the analyte and this can be assumed to be a limitation of the present method. The percentage recoveries and residue of glyphosate in wheat grains samples, were found in the range of 90.0 ± 0.6 % to 93.0 ± 0.6 % and 1.13 ± 0.009 µg g -1 , respectively.