Determination of Glyphosate in Water Samples by Alternating-Current Oscillopolarographic Titration

Abstract

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 nitroso-compound 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%.