A simple and sensitive detection of diquat herbicide using a dental amalgam electrode: a comparison using the chromatographic technique - Melo, Luisa Célia; Salazar-Banda, Giancarlo Richard; Machado, Sergio Antonio Spinola; Lima Neto, Pedro de; De Souza, Djenaine; Correia, Adriana Nunes (Talanta, 2009)