Electroanalytical Study of the Pesticide Asulam

• Tipo: Artigo em Revista Científica Internacional
• Data: 2002

Autores

Henri Nouws (Autor) Outra; Cristina Delerue-Matos (Autor) Outra; José Lima (Autor) FFUP; E. Manuela Garrido (Autor) Outra; Pieter Vincke (Autor) Outra; Noel Maes (Autor) Outra

Revista

Título: International Journal of Environmental Analytical Chemistry

Vol. 82 Nº 2

Páginas: 69-76

ISSN: 0306-7319

Editora: Taylor & Francis

Indexação

ISI Web of Knowledge - 7 Citações

ISI Web of Science

Scopus - 8 Citações

Classificação Científica

FOS: Ciências médicas e da saúde > Outras ciências médicas

CORDIS: Ciências da Saúde

Outras Informações

ID Authenticus: P-000-QET

Resumo (PT): The electrochemical behaviour of the herbicide Asulam was studied by cyclic and square wave voltammetry. Asulam may be irreversibly oxidised at a glassy carbon electrode. Maximum currents were obtained at pH = 1.9 in aqueous electrolyte solution. Based on the electrochemical behaviour of Asulam, two analytical methodologies were developed for its determination in water samples, using square wave voltammetry (SWV) and flow injection analysis (FIA) coupled with an amperometric detector. Limits of detection of 7.1 10 -6 mol L -1 and 1.2 10 -8 mol L -1 for SWV and FIA respectively, were achieved. Repeatability was calculated by assessing the relative standard deviation (%) for 10 consecutive determinations of one sample. The found values were 2.1% for SWV and 5.0% for FIA. Validation of the results provided by SWV and FIA methodologies was performed by comparison with results from an HPLC-DAD technique. Good relative deviations were found (< 5%). Recovery trials were performed to assess the accuracy of the results and the obtained values were between 84% and 107% for both methods. <br> <br> Keywords: Asulam; Herbicides; Oxidation; Square Wave Voltammetry; Flow Injection Analysis; Amperometric Detection <br> <a target="_blank" href="http://www.informaworld.com/smpp/content~db=all~content=a713714602~frm=titlelink?waited=0"> Texto integral </a> <br> <br>

Abstract (EN): The electrochemical behaviour of the herbicide Asulam was studied by cyclic and square wave voltammetry. Asulam may be irreversibly oxidised at a glassy carbon electrode. Maximum currents were obtained at pH = 1.9 in aqueous electrolyte solution. Based on the electrochemical behaviour of Asulam, two analytical methodologies were developed for its determination in water samples, using square wave voltammetry (SWV) and flow injection analysis (FIA) coupled with an amperometric detector. Limits of detection of 7.1 10 -6 mol L -1 and 1.2 10 -8 mol L -1 for SWV and FIA respectively, were achieved. Repeatability was calculated by assessing the relative standard deviation (%) for 10 consecutive determinations of one sample. The found values were 2.1% for SWV and 5.0% for FIA. Validation of the results provided by SWV and FIA methodologies was performed by comparison with results from an HPLC-DAD technique. Good relative deviations were found (< 5%). Recovery trials were performed to assess the accuracy of the results and the obtained values were between 84% and 107% for both methods. <br> <br> Keywords: Asulam; Herbicides; Oxidation; Square Wave Voltammetry; Flow Injection Analysis; Amperometric Detection <br> <a target="_blank" href="http://www.informaworld.com/smpp/content~db=all~content=a713714602~frm=titlelink?waited=0"> Full text </a> <br> <br>

Idioma: Inglês

Tipo (Avaliação Docente): Científica