Spectrophotometric micro-method for the determination of ethanol in commercial beverages |
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| Authors: | Andrea D Magrí A L Magrí Fabrizio Balestrieri Amalia Sacchini D Marini |
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| Institution: | (1) Dipartimento di Chimica, Università“La Sapienza”, I-00185 Roma, Italy, IT;(2) Istituto di Merceologia Università di Perugia, I-06100 Perugia, Italy, IT;(3) Dipartimento delle Dogane e I.I., Direzione Centrale A.M.L.C., via M. Carucci 71, I-00143 Roma, Italy, IT |
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| Abstract: | A sensitive spectrophotometric method for the determination of ethanol with potassium dichromate was developed. Chromium(VI),
in 7 mol L-1 perchloric acid, reacts quantitatively with ethanol to form chromium(III) and acetic acid. The reaction is complete in about
15 min at room temperature and the chromium(VI) consumed may be determined by the decrease of the absorbance at 267 nm. The
analytical working parameters (such as acidity and ionic strength of the solution, temperature and time of the reaction, chromium(VI)
concentration, matrix interferences) were optimized. The apparent molar absorptivities of chromium(VI), in the monomer and
dimer form, and the equilibrium quotient for the dimerization reaction were determined in 3 mol L-1 perchloric acid solution. The method was applied to the analysis of micro samples of commercial beverages (beers, wines and
spirits) without the previous distillation of ethanol.
Received: 9 April 1996/Revised: 3 June 1996/Accepted: 11 June 1996 |
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