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. 1990 Aug;37(8):789-94.
doi: 10.1016/0039-9140(90)80120-5.

Voltammetric determination of linuron at a carbon-paste electrode modified with sepiolite

P Hernandez  1 , J Vicente, M Gonzalez, L Hernandez
Affiliations

Voltammetric determination of linuron at a carbon-paste electrode modified with sepiolite

P Hernandez et al. Talanta. 1990 Aug.

Abstract

The determination of linuron by differential pulse voltammetry with a carbon-paste electrode modified with 20% w/w sepiolite has been studied. The linuron is preconcentrated under open-circuit conditions at pH 2.0. With 0.01M potassium nitrate at pH 1.7 in the measurement cell, a sweep rate of 30 mV/sec and a pulse amplitude of 100 mV, an oxidation wave with a peak potential of 1.2 V is obtained. Under these conditions, determination limits of 75 ng/ml have been obtained, with a relative error of +2.8% and a relative standard deviation of 8.0%. The method has been applied to the direct determination of linuron in river water with no previous separation of the pesticide. Determination in sea-water is not possible, as chloride interferes at high concentration.

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