Abstract
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 μ gmL –1 . The limit of detection and quantification were found to be 0.20±0.01 and 0.70±0.02 μ gmL –1 with a high sample throughput of 60 samples h –1 . The investigation of interference effect shows that among the compounds studied, only aminomethyl phosphonic 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 μ g g –1 , respectively. Keywords: Glyphosate, photoactive, absorbance, flow injection analysis, residue
Highlights
The active ingredient of Roundup® and about 50 more commercial formulations, glyphosate [N-(phosphonomethyl) glycine], is a broad-spectrum herbicide
The absorbance of the product was scanned at different wavelengths and maximum absorbance was observed at 405 nm (Fig. 1).[32,33]
The reaction was observed to be fast enough at room temperature that it can be adopted to the flow injection system for determination of glyphosate herbicide
Summary
The active ingredient of Roundup® and about 50 more commercial formulations, glyphosate [N-(phosphonomethyl) glycine], is a broad-spectrum herbicide. Though World Health Organization (WHO) has declared glyphosate as non-carcinogenic, still its impacts on the flora and microorganisms are subtle. It has a low mammalian toxicity limits and causes digestive tract irritation, eyes and skin irritation, low blood pressure and respiratory dysfunction in human if orally taken.[1,6] Glyphosate has been listed as one of the US national primary drinking water contaminants with a maximum contaminant level (MCL) of 0.7 mg L–1.4,8
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