Abstract − Analytical Sciences, 20(10), 1415 (2004).
Determination of Glyphosate in Water Samples by Alternating-Current Oscillopolarographic Titration
Junping XIAO,** Qingxiang ZHOU,* Bo YANG,* and Zhenzhen WANG*
*Henan Key Laboratory for Environmental Pollution Control, School of Chemistry and Environmental Sciences, Henan Normal University, Xinxiang 453007, P. R. China
**Department of Chemistry, University of Science and Technology Beijing, Beijing 100083, P. R. China
**Department of Chemistry, University of Science and Technology Beijing, Beijing 100083, P. R. China
This paper describes a novel, simple and sensitive method for the determination of glyphosate in water samples by alternating-current oscillopolarographic titration. Under an acidic condition, glyphosate can be transferred into a nitrosocompound by reacting with NaNO2. The titration end-point was obtained by the formation of a sharp cut in the oscillopolarographic with infinitesimal NaNO2 on double platinum electrodes. The results showed that glyphosate had an excellent linear relationship over the range of 7.16 × 10-6 - 4.14 × 10-3 mol L-1, the RSD of the proposed method was lower than 3%, and the spiked recoveries of three real water samples were in the range of 97.7 - 100.2%.
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