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Conference Paper: Application of square-wave voltammetry for the determination of ascorbic acid in soft drinks and fruit juices using a flow-injection system

TitleApplication of square-wave voltammetry for the determination of ascorbic acid in soft drinks and fruit juices using a flow-injection system
Authors
Issue Date1992
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/aca
Citation
Analytica Chimica Acta, 1992, v. 261 n. 1-2, p. 375-380 How to Cite?
AbstractThe application of square-wave voltammetry for detection in the flow-injection determination of ascorbic acid in soft drinks and fruit juices was investigated. The pH of the solution was buffered at 2.87 to stabilize the ascorbic acid prior to analysis. Parameters such as scan rate, square-wave amplitude, step height and flow-rate of electrolyte were found to have little effect on the potential, but a significant effect on the current. The analytical current is only slightly affected by the flow-rate of the electrolyte and a maximum scan rate of 0.5 V s-1 can be used. As a compromise between sensitivity and selectivity, 40 mV was chosen as the amplitude of the square wave and 10 mV as the potential step height. Similarly, a flow-rate of 0.5 ml min-1 and an injection volume of 100 μl were chosen as a compromise between the sensitivity and resolution of the FIA method. Using the above procedures, the maximum number of samples that could be analysed was 120 h-1. The linear calibration range was from 2 x 10-6 to 6 x 10-3 M and the determination limit (10δ) was 2 x 10-7 M. No significant interference was found from additives commonly found in juices and drinks samples within their normal concentration ranges. Four juice samples were analysed using the developed method and the results were compared with those given by the established AOAC method. No significant difference was observed between the two methods used for the four samples studied.
Persistent Identifierhttp://hdl.handle.net/10722/168794
ISSN
2015 Impact Factor: 4.712
2015 SCImago Journal Rankings: 1.548
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorFung, YSen_US
dc.contributor.authorMo, SYen_US
dc.date.accessioned2012-10-08T03:34:17Z-
dc.date.available2012-10-08T03:34:17Z-
dc.date.issued1992en_US
dc.identifier.citationAnalytica Chimica Acta, 1992, v. 261 n. 1-2, p. 375-380en_US
dc.identifier.issn0003-2670en_US
dc.identifier.urihttp://hdl.handle.net/10722/168794-
dc.description.abstractThe application of square-wave voltammetry for detection in the flow-injection determination of ascorbic acid in soft drinks and fruit juices was investigated. The pH of the solution was buffered at 2.87 to stabilize the ascorbic acid prior to analysis. Parameters such as scan rate, square-wave amplitude, step height and flow-rate of electrolyte were found to have little effect on the potential, but a significant effect on the current. The analytical current is only slightly affected by the flow-rate of the electrolyte and a maximum scan rate of 0.5 V s-1 can be used. As a compromise between sensitivity and selectivity, 40 mV was chosen as the amplitude of the square wave and 10 mV as the potential step height. Similarly, a flow-rate of 0.5 ml min-1 and an injection volume of 100 μl were chosen as a compromise between the sensitivity and resolution of the FIA method. Using the above procedures, the maximum number of samples that could be analysed was 120 h-1. The linear calibration range was from 2 x 10-6 to 6 x 10-3 M and the determination limit (10δ) was 2 x 10-7 M. No significant interference was found from additives commonly found in juices and drinks samples within their normal concentration ranges. Four juice samples were analysed using the developed method and the results were compared with those given by the established AOAC method. No significant difference was observed between the two methods used for the four samples studied.en_US
dc.languageengen_US
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/acaen_US
dc.relation.ispartofAnalytica Chimica Actaen_US
dc.titleApplication of square-wave voltammetry for the determination of ascorbic acid in soft drinks and fruit juices using a flow-injection systemen_US
dc.typeConference_Paperen_US
dc.identifier.emailFung, YS:ysfung@hku.hken_US
dc.identifier.authorityFung, YS=rp00697en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1016/0003-2670(92)80216-Ten_US
dc.identifier.scopuseid_2-s2.0-0026582888en_US
dc.identifier.volume261en_US
dc.identifier.issue1-2en_US
dc.identifier.spage375en_US
dc.identifier.epage380en_US
dc.identifier.isiWOS:A1992HX85600049-
dc.publisher.placeNetherlandsen_US
dc.identifier.scopusauthoridFung, YS=13309754700en_US
dc.identifier.scopusauthoridMo, SY=7004957705en_US

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