✦ LIBER ✦

Catalytic kinetic determination of trace amounts of ascorbic acid with single-sweep oscillopolarography

✍ Scribed by Zhi-Liang Jiang; Ai-Hui Liang

Publisher: Elsevier Science
Year: 1993
Tongue: English
Weight: 400 KB
Volume: 278
Category: Article
ISSN: 0003-2670
DOI: 10.1016/0003-2670(93)80084-x

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✦ Synopsis

A highly sensitive and selective catalytic method with single-sweep d.c. oscillopolarographic detection is described for the determination of ascorbic acid, based on its activation effect on the slow vanadium(V)-catalysed reaction of BIG, and methyl orange in sulphuric acid medium at 60°C. The oxidation product of methyl orange exhibits a polarographjc wave at -0.40 V vs. SCB in the supporting electrolyte of sodium hydroxide, and was chosen as the indicator component for the indicator reaction. A calibration graph between 8 and 160 ng ml-' ascorbic acid was obtained by the fmed-time procedure. The detection limit was 4 ng ml-'. Possible interferences by co-existing substances were examined.

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