Ascorbic acid determination using a carbon paste electrode modified with iron(III) ions adsorbed on humic acid
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| Natura: | Artículo científico |
| Lingua: | en |
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Universidade Estadual Paulista Júlio de Mesquita Filho
2006
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| _version_ | 1876471771373240320 |
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| author | T. N. Oliveira |
| author_facet | T. N. Oliveira |
| contents | Ascorbic acid determination using a carbon paste electrode modified with iron(III) ions adsorbed on humic acid T. N. Oliveira M. A. Ballin L. S. Silva C. R. M. Peixoto Química humic acids ascorbic acid iron(III) ions carbon paste electrode An amperometric sensor was constructed, by using humic acids to immobilize Fe3+ ions ona carbon paste electrode (CPE-HA-Fe), and used for ascorbic acid (H2A) determination. The cyclicvoltammogram of the electrode showed electrochemical response due to the Fe3+/Fe2+ couple atE1/2=+0.78 V vs SCE, using 0.5 mol L-1 KCl and 0.2 mol L-1 acetate/0.020 mol L-1 phosphate buffer,at pH = 5.4, as supporting electrolyte. When H2A is added to the electrolyte solution it is observed anoxidation process. The oxidation current, obtained by chronoamperommetry at +0.87 V vs SCE, isproportional to the concentration, represented by the equation I(µA) = 7.6286 [H2A] (mmol L-1) +1.9583, r = 0.9996, for concentrations between 0.0 and 1.4 mmol L-1. The electrode showed highstability and was used for H2A determination in a natural orange juice. 2006 artículo científico 0100-4670 https://www.redalyc.org/articulo.oa?id=42931405 en http://www.redalyc.org/revista.oa?id=429 Eclética Química application/pdf Universidade Estadual Paulista Júlio de Mesquita Filho Eclética Química (Brasil) Num.4 Vol.31 |
| format | Artículo científico |
| id | redalyc_42931405 |
| institution | Redalyc |
| language | en |
| publishDate | 2006 |
| publisher | Universidade Estadual Paulista Júlio de Mesquita Filho |
| spellingShingle | Ascorbic acid determination using a carbon paste electrode modified with iron(III) ions adsorbed on humic acid T. N. Oliveira Química humic acids ascorbic acid iron(III) ions carbon paste electrode Ascorbic acid determination using a carbon paste electrode modified with iron(III) ions adsorbed on humic acid T. N. Oliveira M. A. Ballin L. S. Silva C. R. M. Peixoto Química humic acids ascorbic acid iron(III) ions carbon paste electrode An amperometric sensor was constructed, by using humic acids to immobilize Fe3+ ions ona carbon paste electrode (CPE-HA-Fe), and used for ascorbic acid (H2A) determination. The cyclicvoltammogram of the electrode showed electrochemical response due to the Fe3+/Fe2+ couple atE1/2=+0.78 V vs SCE, using 0.5 mol L-1 KCl and 0.2 mol L-1 acetate/0.020 mol L-1 phosphate buffer,at pH = 5.4, as supporting electrolyte. When H2A is added to the electrolyte solution it is observed anoxidation process. The oxidation current, obtained by chronoamperommetry at +0.87 V vs SCE, isproportional to the concentration, represented by the equation I(µA) = 7.6286 [H2A] (mmol L-1) +1.9583, r = 0.9996, for concentrations between 0.0 and 1.4 mmol L-1. The electrode showed highstability and was used for H2A determination in a natural orange juice. 2006 artículo científico 0100-4670 https://www.redalyc.org/articulo.oa?id=42931405 en http://www.redalyc.org/revista.oa?id=429 Eclética Química application/pdf Universidade Estadual Paulista Júlio de Mesquita Filho Eclética Química (Brasil) Num.4 Vol.31 |
| title | Ascorbic acid determination using a carbon paste electrode modified with iron(III) ions adsorbed on humic acid |
| topic | Química humic acids ascorbic acid iron(III) ions carbon paste electrode |
| url | https://www.redalyc.org/articulo.oa?id=42931405 |