Electrooxidation and determination of dopamine using a Nafion (R)-cobalt hexacyanoferrate film modified electrode

Made available in DSpace on 2013-08-28T14:11:53Z (GMT). No. of bitstreams: 1 WOS000254340700035.pdf: 115446 bytes, checksum: b5ba1c8598579dbf9fa50a3e3e6a9e0f (MD5) Made available in DSpace on 2013-09-30T19:22:41Z (GMT). No. of bitstreams: 2 WOS000254340700035.pdf: 115446 bytes, checksum: b5ba1c8598579dbf9fa50a3e3e6a9e0f (MD5) WOS000254340700035.pdf.txt: 25597 bytes, checksum: 45111b8732e4e645a8f0eebaeb30204f (MD5) Previous issue date: 2008-03-01 Submitted by Vitor Silverio Rodrigues (vitorsrodrigues@reitoria.unesp.br) on 2014-05-20T15:33:54Z No. of bitstreams: 2 WOS000254340700035.pdf: 115446 bytes, checksum: b5ba1c8598579dbf9fa50a3e3e6a9e0f (MD5) WOS000254340700035.pdf.txt: 25597 bytes, checksum: 45111b8732e4e645a8f0eebaeb30204f (MD5) Made available in DSpace on 2014-05-20T15:33:54Z (GMT). No. of bitstreams: 2 WOS000254340700035.pdf: 115446 bytes, checksum: b5ba1c8598579dbf9fa50a3e3e6a9e0f (MD5) WOS000254340700035.pdf.txt: 25597 bytes, checksum: 45111b8732e4e645a8f0eebaeb30204f (MD5) Previous issue date: 2008-03-01 The electrocatalysis of dopamine has been studied using a cobalt hexacyanoferrate film (CoHCFe)-modified glassy carbon electrode. Using a rotating disk CoHCFe-modified electrode, the reaction rate constant for dopamine was found to be 3.5 x 105 cm(3) mol(-1) s(-1) at a concentration of 5.0 x 10(-5) mol L-1. When a Nafion (R) film is applied to the CoHCFe-modified electrode surface a high selectivity for the determination of dopamine over ascorbic acid was obtained. The analytical curve for dopamine presented linear dependence over the concentration range from 1.2 x 10(-5) to 5.0 x 10(-4) mol L-1 with a slope of 23.5 mA mol(-1) L and a linear correlation coefficient of 0.999. The detection limit of this method was 8.9 x 10(-6) mol L-1 and the relative standard deviation for five measurements of 2.5 x 10(-4) mol L-1 dopamine was 0.58%. UNESP, Inst Quim, Dept Quim Analit, BR-14800900 Araraquara, SP, Brazil UERN, FANAT, Dept Quim, BR-59600010 Mossoro, RN, Brazil Univ Loughborough, Dept Chem, Loughborough LE11 3TU, Leics, England USP, Fac Filosofia Ciencias & Letras Ribeirao Pret, Dept Quim, BR-14040901 Ribeirao Preto, SP, Brazil UNESP, Inst Quim, Dept Quim Analit, BR-14800900 Araraquara, SP, Brazil