Trace iron determination in aminoisophthalic acid using differential-pulse cathodic stripping voltammetry at carbon paste electrodes |
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| Authors: | Alena Komersová ,Martin Barto&scaron ,Kurt Kalcher,Karel Vyt?as |
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| Affiliation: | 1. Department of Analytical Chemistry, University of Pardubice, CZ-532 10 Pardubice, Czech Republic;2. Institut für Analytische Chemie, Karl-Franzens-Universität Graz, A-8010 Graz, Austria;1. Nanyang Technological University - Hebrew University of Jerusalem - Ben-Gurion University (NEW-CREATE) Programme, 1 CREATE Way, Research Wing, #02-06/08, 138602, Singapore;2. Dipartimento di Scienze AgroAlimentari, Ambientali e Animali, University of Udine, via delle Scienze 206, 33100 Udine, Italy;3. Department of Civil and Environmental Engineering, National University of Singapore, Blk E1A-07-03 1 Engineering Drive 2, 117576, Singapore;4. Department of Civil and Environmental Engineering, National University of Singapore, 5A Engineering Drive 1, T lab #08-03, 117411, Singapore;5. School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798, Singapore;6. Department of Biotechnology Engineering National Institute for Biotechnology in the Negev and the Ilse Katz Center for Meso and Nanoscale Science and Technology, Ben-Gurion University of the Negev, Beer-Sheva 84105, Israel;1. Department of Chemistry, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand;2. Center of Excellence for Innovation in Chemistry, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand;3. Research Center on Chemistry for Development of Health Promoting Products from Northern Resources, Chiang Mai University, Chiang Mai 50200, Thailand;4. The Graduate School, Chiang Mai University, Chiang Mai 50200, Thailand |
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| Abstract: | Application of differential-pulse cathodic stripping voltammetry using a carbon paste electrode (consisting of carbon powder and liquid paraffin) have been investigated for trace determination of iron in 5-aminoisophthalic acid (AIPA). Samples were dissolved in 1 M HCl, pH was adjusted to 4–5 after addition of EDTA. Voltammetric measurements were performed after filtration. No sample decomposition (mineralization) was necessary. The method showed a good linearity between current and concentration from 3×10−7 to 5×10−5 mol dm−3 of iron, with a detection limit of 3×10−7 mol dm−3 (resp. 1 ppm in solid AIPA). The results agreed well to those obtained by atomic absorption spectrometry (AAS) using electrothermic atomisation. For AAS measurement, however, microwave digestion of samples was necessary. |
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| Keywords: | Iron determination Trace analysis Voltammetry Carbon paste electrode |
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