Application of square-wave voltammetry for the determination of ascorbic acid in soft drinks and fruit juices using a flow-injection system
✍ Scribed by Ying-Sing Fung; Song-Ying Mo
- Publisher
- Elsevier Science
- Year
- 1992
- Tongue
- English
- Weight
- 537 KB
- Volume
- 261
- Category
- Article
- ISSN
- 0003-2670
No coin nor oath required. For personal study only.
✦ Synopsis
The application of square-wave voltammetly for detection m the flow-mJection determmatlon of ascorlxc acid m soft drinks and fruit Jmces was mvestlgated The pH of the solution was buffered at 2 87 to stabdlze the ascorbic acid pnor to analysis Parameters such as scan rate, square-wave amphtude, step height and flow-rate of electrolyte were found to have little effect on the potential, but a slgmficant effect on the current The analytical current IS only slightly affected by the flow-rate of the electrolyte and a maxLmum scan rate of 05 V s-l can be used As a compronuse between sensltw&y and select&y, 40 mV was chosen as the amphtude of the square wave and 10 mV as the potentml step height Bmdarly, a flow-rate of 0 5 ml mm-' and an mJectlon volume of 100 ~1 were chosen as a compronuse between the sensltivlty and resolution of the FIA method Usmg the above procedures, the maxLmum number of samples that could be analysed was 120 h-' The hnear cahbratlon range was from 2 x 10e6 to 6 x 10e3 M and the determmation hnut (10~) was 2 X lo-' M No sigmficant interference was found from additives commonly found m JUHXS and drinks samples wlthm 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 slgmficant difference was observed between the two methods used for the four samples sturhed