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Titolo:
THE DETERMINATION OF ETHANOL IN WINE BY VOLTAMMETRY WITH AN INTERNAL STANDARD
Autore:
YU JJ; HUANG WG; HIBBERT DB;
Indirizzi:
UNIV NEW S WALES,DEPT ANALYT CHEM SYDNEY NSW 2052 AUSTRALIA UNIV NEW S WALES,DEPT ANALYT CHEM SYDNEY NSW 2052 AUSTRALIA
Titolo Testata:
Electroanalysis
fascicolo: 7, volume: 9, anno: 1997,
pagine: 544 - 548
SICI:
1040-0397(1997)9:7<544:TDOEIW>2.0.ZU;2-F
Fonte:
ISI
Lingua:
ENG
Soggetto:
PULSED AMPEROMETRIC DETECTION; ELECTROCHEMICAL DETECTION; PLATINUM-ELECTRODES; FLOW-INJECTION; CHROMATOGRAPHY; GOLD;
Keywords:
ETHANOL OXIDATION; CYCLIC VOLTAMMETRY; OSTERYOUNG SQUARE-WAVE VOLTAMMETRY; INTERNAL STANDARD; WINE ANALYSIS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
20
Recensione:
Indirizzi per estratti:
Citazione:
J.J. Yu et al., "THE DETERMINATION OF ETHANOL IN WINE BY VOLTAMMETRY WITH AN INTERNAL STANDARD", Electroanalysis, 9(7), 1997, pp. 544-548

Abstract

A rapid method for the electroanalysis of ethanol is presented that incorporates flow extraction at room temperature, with voltammetric detection and potassium ferrocyanide [K4Fe(CN)(6)] as internal standard. in 0.1 M NaOH electrolyte, ethanol was oxidised at a platinum comb-shaped working electrode at -300 mV (vs. a Ag/AgCl reference electrode) and K4Fe(CN)(6) was oxidized at +180 mV. The ratio of the anodic peak currents was Linear with ethanol concentration in the range of 0.1 to 8.0% (v./v.), and the detection limit (calculated as 3 sigma background) was 0.012 % (v./v.) for Osteryoung square wave voltammetry (OSWV) and 0.023 %(v./v.) for cyclic voltammetry (CV). The average extraction efficiency of ethanol from aqueous solutions, at 20 +/- 1 degrees C, was 8.5%. The repeatability was in the range of 2.5 to 3.3% RSD (n = 8),and accuracy was in the range of 95.2 to 104.7% for the determinationof wine samples. Application to wines compared well with GC and HPLC methods and the nominal ethanol concentration determined by gravimetry. Analytical parameters in CV and OSWV are optimized, and the dependence of the extraction efficiency with temperature and nitrogen gas flowis presented.

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Documento generato il 21/09/18 alle ore 07:49:39