RESUMO

A carbon paste electrode was used for the electrochemical determination of linuron concentrations in water and vegetable extracts. Optimal conditions were established with respect to electrode activation (electrochemical pretreatment), time accumulation, potential accumulation, scan rate, and pH. The limit of detection achieved with a pre-concentration step was 23.0 µg L(-1). Recovery measurements in vegetable extract and natural water samples were in the range of 98-103%, indicating that the proposed electrochemical method can be employed to analyze linuron in these matrices. The determination results were in good agreement with HPLC results.

Assuntos

Carbono/química , Linurona/química , Verduras/química , Água/química , Cromatografia Líquida de Alta Pressão , Eletroquímica/métodos , Eletrodos , Herbicidas/química , Linurona/análise , Estrutura Molecular , Potenciometria