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Title: Photochemical reaction between ascorbic acid and silver (I) in aqueous Triton X-I 00 and its analytical application
Authors: Pal, Anjali
Issue Date: Apr-1999
Publisher: NISCAIR-CSIR, India
Abstract: A new spectrophotometric method for ascorbic acid determination has been described. Colourless silver (I) is photochemically reduced in Triton X -100 (TX -100) medium by ascorbic acid to yellow silver sol having particles with nanometer range size. The particles show a surface plasmon absorption band at 415 nm with molar absorptivity 1.43 × 104 lit mol-1 cm-1 and the Sandell sensitivity of 1.23 × 10-2 μg cm-2. The determination is possible in the range of 0-13 ppm of ascorbic acid. The limit of detection is 0.4 ppm. The relative standard deviation is < ±5% for all determinations and the confidence limit for 7.50 ppm of ascorbic acid (10 determinations, 95%) is 7.84±0.32. Statistical parameters; effects of TX-100 concentration, irradiation time and interferents are studied. The method is simple, quick and suitable for vitamin C analysis in pharmaceutical preparations.
Page(s): 484-487
Appears in Collections:IJC-B Vol.38B(04) [April 1999]

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