Extraction and dissipation kinetics of glyphosate in water
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Date
2016
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Punjab Agricultural University, Ludhiana
Abstract
The present investigation was undertaken to standardize an analytical method for quantification of glyphosate and to study its dissipation in water. Optimization experiment was carried out to study the influence of different parameters affecting derivatization of glyphosate. Glyphosate was quantified using fluorescence spectrophotometer, HPLC-UV and UV-visible spectrophotometer. Fluorescence spectrophotometer was the most sensitive technique for quantification of glyphosate. The method was validated in water of varying physicochemical properties. The average recovery and sensitivity of method decreased in different water matrices. So, the method was modified to increase the average recovery and sensitivity. The dissipation of glyphosate was studied in distilled, tap and ground water at pH 4, 7 and 9.2 under different light conditions. Glyphosate was persistent under dark conditions. The dissipation of glyphosate followed first order kinetics with half life from 1.56 to 11.27 days and 13.14 days to 36.70 days under UV light and sunlight, respectively. The dissipation of glyphosate was in the order: distilled water>tap water>ground water indicating increase in half life with increase in electrolytic conductance of water. Results showed that pH also played a significant role on dissipation of glyphosate in tap water and ground water. However, in distilled water no significant effect of pH on dissipation of glyphosate was observed.
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