Determination of isomethiozin by differential-pulse polarography

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Abstract
A method for the determination of the triazine-based herbicide isomethiozin by differential-pulse polarography is proposed. The reaction is performed in 0.1 M NaClO4 using a Britton-Robinson buffer at pH 1.90. Two reduction waves are obtained at –0.52 and –0.93 V and the system is irreversible and controlled mainly by diffusion. The detection limit is 1 × 10–6 M for the first wave with an error of less than 2%. Finally, a method is proposed for the determination of isomethiozin in soil, which can be used for the detection of levels as low as 0.04 µg g–1.

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