Determination of Glyphosate in Drinking Water by Ion Chromatography

Objective To study the determination of glyphosate in drinking water by using ion chromatography.Methods With the flow rate of 1.0ml/min,an eluent of mixed solution of 6.4 mmol/L NaCO3 and 3.2 mmol/L NaHCO3 was used in the anion-exchange separation;the determination was performed by an electric conductivity detector.Results The standard curve average correlation coefficient was 0.9997 with glyphosate concentration in the range of 0.05～3.0μg/ml,the detection limit for glyphosate was 0.014μg/ml.Under determination of confecting water samples with the concentration of 0.976μg/ml glyphosate,the relative standard deviations of concentration and retention time were 0.38% and 0.17% respectively.The sample recovery rate in the standard addition test was between 98.0% and 102.5%.Conclusions The method is simple,quick,and low cost,with satisfactory testing results,which can be used for the detection of glyphosate in water samples.