0872-1904 0872-1904 S0872-19042008000100011 Portugal 00 00 2008 00 00 2008 26 1 147 157

0.994 and about 48 samples are analysed per hour. Application of the proposed method to the analysis of soft drinks is presented.]]>

 Chemically Modified Carbon Paste Electrodes for Ascorbic Acid Determination in Soft Drinks by Flow Injection Amperometric Analysis

 

 

M. Goreti F. Sales,* M.S.A. Castanheira, Rosa M.S. Ferreira, M. Carmo V.F. Vaz, and Cristina Delerue-Matos

 

Requimte/Instituto Superior de Engenharia do Porto, Rua Dr. António Bernardino de Almeida nº 431,

4200-072 Porto, Portugal

 

Received 1st August 2007; accepted 30th January 2008

 

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Abstract

Simple, rapid and precise amperometric methods for quantification of ascorbic acid (AA) are presented. Glassy carbon (GC), carbon paste (CP) and modified carbon paste (MCP) electrodes are used for this purpose. MCP electrodes are of CP with 10 % vanadate (V). All electrodes are inserted in a wall-jet device with an Ag/AgCl reference electrode and a platinum auxiliary electrode. This device is coupled to a flow injection analysis (FIA) set-up. Hydrodynamic and amperometric parameters are optimized unvaryingly.

GC electrodes present slopes of 4.75 ´ 105 nA L mol-1 (± 6.4 %) under optimum conditions. CP and MCP electrodes show higher sensitivity, with slopes of 6.37 ´ 105 nA L mol-1 (± 6.6 %) and 7.32 ´ 105 nA L mol-1 (± 4.4 %). Linear responses range (1.0-2.0) ´ 10-6 to (0.8-1.0) ´ 10-5 mol L-1. Correlation coefficients were > 0.994 and about 48 samples are analysed per hour. Application of the proposed method to the analysis of soft drinks is presented.

Keywords: ascorbic acid, chemically modified electrodes, flow-injection analysis, amperometry.

 

 

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* Corresponding author. E-mail address: mgf@isep.ipp.pt

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