Electroanalytical Study of the Pesticide Asulam

• Type: Article in International Scientific Journal
• Date: 2002

Authors

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

Journal

Title: International Journal of Environmental Analytical Chemistry

Vol. 82 No. 2

Pages: 69-76

ISSN: 0306-7319

Publisher: Taylor & Francis

Indexing

ISI Web of Knowledge - 7 Citations

ISI Web of Science

Scopus - 8 Citations

Scientific classification

FOS: Medical and Health sciences > Other medical sciences

CORDIS: Health sciences

Other information

Authenticus ID: 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>

Language: English

Type (Professor's evaluation): Scientific