Determination of glyphosate in water samples by alternating-current oscillopolarographic titration.

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 x 10(-6) - 4.14 x 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%.