University of North Florida
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Stuart Chalk, Ph.D.
Department of Chemistry
University of North Florida
Phone: 1-904-620-1938
Fax: 1-904-620-3535
Website: @unf

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Classification: Food -> candy

Citations 1

"Indirect Flow Injection Determination Of Ascorbic Acid By Flame Atomic Absorption Spectrometry"
Microchim. Acta 1997 Volume 126, Issue 1-2 Pages 53-58
M del Carmen Yebra-Biurrun, Rosa Maria Cespón-Romero and Pilar Bermejo-Barrera

Abstract: A portion (85 µL) of 75 µg/ml Fe(III) in 0.5 M HNO3 was injected into a flow (0.6 ml/min) of 2.5 mM 1,10-phenanthroline, which merged with a flow (2.3 ml/min) of aqueous sample solution containing ascorbic acid (diluted fruit juice, dissolved sweets or dissolved tablets), passed through a PTFE mixing coil (100 cm x 0.8 mm i.d.), merged with a flow (1.6 ml/min) of 9 mM picric acid, passed through a PTFE reaction coil (100 cm x 0.8 mm i.d.) and then through a 0.1 g Amberlite XAD-4 resin column (0.95 cm x 1.6 mm i.d.) prior to AAS detection at 248.3 nm. The signal response was caused by Fe(III), and increased with decreasing ascorbic acid concentration. The calibration graph was linear from 0.5-25 µg/ml ascorbic acid, the detection limit was 0.2 µg/ml and the RSD (n = 11) at 10 µg/ml was 2.9%. Recoveries were 96.1-103.7% and the sample throughput was 90/h. Up to 50-fold excesses of potential interferents did not affect the results (details given).
Ascorbic acid Spectrophotometry Reverse Indirect Interferences Amberlite