Gonzalez-Rodriguez, Jose and Perez Juan, Pedro and Luque de Castro, Maria Dolores (2001) Two-parameter determination in vinegar by a flow injection-pervaporation system. The analyst, 126 . pp. 1177-1181. ISSN 0003-2654

Preview

PDF analyst_2001.pdf Available under License Creative Commons Attribution Non-commercial. Download (190Kb)

Abstract

A flow-injection method (FI) for the sequential determination of ethanol and acetic acid in vinegar is reported. The determination of ethanol is based on the oxidation of the pervaporated ethanol by Cr2O7K2. The acetic acid is determined by an acid-base reaction with Thymol Blue as the indicator. Both reactions are monitored photometrically at 600 nm using a single detector. Optimisation studies and assessment of the sequential FI method are also reported. The linear determination range is between 0-12 % (v/v) for ethanol and 0-10 % (grams of acetic acid in 100 ml) for acetic acid. The sample throughput of the sequential manifold is 7 per hour. The new method has been applied to vinegar samples and the results obtained are in excellent agreement with those from the reference methods used in Spain.

Item Type:	Article
Additional Information:	A flow-injection method (FI) for the sequential determination of ethanol and acetic acid in vinegar is reported. The determination of ethanol is based on the oxidation of the pervaporated ethanol by Cr2O7K2. The acetic acid is determined by an acid-base reaction with Thymol Blue as the indicator. Both reactions are monitored photometrically at 600 nm using a single detector. Optimisation studies and assessment of the sequential FI method are also reported. The linear determination range is between 0-12 % (v/v) for ethanol and 0-10 % (grams of acetic acid in 100 ml) for acetic acid. The sample throughput of the sequential manifold is 7 per hour. The new method has been applied to vinegar samples and the results obtained are in excellent agreement with those from the reference methods used in Spain.
Keywords:	ethanol, acetic acid, alcohol, flow injection, pervaporation, spectrophotometry, vinegar, chemometry, experimental design, method optimisation, analytical chemistry
Subjects:	F Physical Sciences > F112 Colour Chemistry F Physical Sciences > F110 Applied Chemistry F Physical Sciences > F190 Chemistry not elsewhere classified F Physical Sciences > F100 Chemistry F Physical Sciences > F180 Analytical Chemistry
Divisions:	College of Sciences > Faculty of Science > School of Life Sciences
Depositing User:	Jose Gonzalez-Rodriguez
Date Deposited:	08 Jan 2010 10:31
Last Modified:	13 Mar 2013 08:34
URI:	http://eprints.lincoln.ac.uk/id/eprint/2115

Actions (login required)

View Item