Abstract
The voltammeric behaviour of rimsulfuron herbicide has been studied by square wave stripping voltammetry on static hanging mercury drop electrode. It exhibited a well-defined peak within the pH range of 1.0–6.0, having a maximum peak response at −600 mV (vs.Ag/AgCl) at pH 3.0. The factors such as accumulation potential (Eacc), accumulation time (tacc), frequency (f), pulse amplitude (ΔE) and step potential (ΔEs) have been optimised. The calibration plot was a straight line in the range of 4.4–134.4 μg L−1 with a detection limit of 1.3 μg L−1. The validity of the method was assessed from the recoveries of spiked lake water, tomato juice and agrochemical formulation of Doncep®. The results of the experiments conducted for five recoveries were 48.8 ± 1.7 and 49.7 ± 1.0 μg L−1, which are very close to the rimsulfuron spiked to lake water and tomato juice (50 μg L−1), with a relative error of –2.4% and −0.6%, respectively. The electrode reaction mechanism was also postulated.
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