Determination of linuron in soil by stripping voltammetry with a carbon fiber microelectrode

A carbon fiber microelectrode was used for the electroanalytical determinat ion of Linuron (LIN) in soil extracts. The microelectrode was subjected to an electrochemical pretreatment in order to improve the herbicide adsorptio n on the electrode surface. With this preconcentration step, detection limi ts of 80 ng ml(-1) and determination limits of 260 ng ml(-1) were reached. Optimal conditions with respect to accumulation time and potential, scan ra te and pH were established. The LIN was determined in a soil sample with th e method proposed and the results found were comparable to those obtained b y HPLC. (C) 2001 Elsevier Science B.V. All rights reserved.