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Cyclic voltammetry and electrochemical impedance spectroscopy were used to characterize the electrooxidation process at +1.0\u2005V vs. SCE over a wide pH range, with the result that no adsorption of analyte or products occurs, unlike at other carbon\u2010based electrode materials. Quantification was carried out using cyclic voltammetry, differential pulse voltammetry, and square\u2010wave voltammetry. Linear ranges were determined (up to 21\u2005\u03bcmol L<jats:sup>\u22121<\/jats:sup> with cyclic voltammetry) as well as limits of detection (0.15\u2005\u03bcmol L<jats:sup>\u22121<\/jats:sup> by differential pulse voltammetry). Four different types of commercial samples were successfully analyzed. Recovery tests were performed which agreed with those obtained by spectrophotometric evaluation. The advantages of this electrode material for repetitive analyzes, due to the fact that no electrode surface renewal is needed owing to the lack of adsorption, are highlighted.<\/jats:p>","DOI":"10.1002\/elan.200804329","type":"journal-article","created":{"date-parts":[[2008,9,18]],"date-time":"2008-09-18T13:37:36Z","timestamp":1221745056000},"page":"2287-2293","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":40,"title":["A Graphite\u2010Polyurethane Composite Electrode for the Analysis of Furosemide"],"prefix":"10.1002","volume":"20","author":[{"given":"Felipe\u2005S.","family":"Semaan","sequence":"first","affiliation":[]},{"given":"Edilson\u2005M.","family":"Pinto","sequence":"additional","affiliation":[]},{"given":"\u00c9der\u2005T.\u2005G.","family":"Cavalheiro","sequence":"additional","affiliation":[]},{"given":"Christopher\u2005M.\u2005A.","family":"Brett","sequence":"additional","affiliation":[]}],"member":"311","published-online":{"date-parts":[[2008,10,23]]},"reference":[{"key":"e_1_2_1_1_2","volume-title":"Wilson and Gisvold's Textbook of Organic Medicinal and Pharmaceutical Chemistry","author":"Delgado J. 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