Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7681982 | Talanta | 2013 | 5 Pages |
Abstract
A simple and rugged flow set up was designed for spectrophotometric determination of sulphide, sulphite and ethanol aiming at quality assessment of wines, control of industrial fermentation, and selection of yeast strain. The different assays involved gas diffusion through a Teflon planar membrane and were carried out after minor modifications in the manifold, namely reagent composition and total flow rate. Main figures of merit: linear analytical curves=0.50-6.0 mg Lâ1 S2â, 2.5-20.0 mg Lâ1 SO3â and 5.0-25.0% (v/v) of ethanol; detection limits (3Ï)=0.035 mg Lâ1 S2â, 0.2 mg Lâ1 SO3â and 0.18% (v/v) of ethanol; peak height r.s.d.=2.18% for 4.03 mg Lâ1 S2â spiked molasses, 2.21% for a 9.82 mg Lâ1 SO3â wine and 2.07% for a typical wine (12.53% v/v of ethanol), sampling rate=15, 57 and 29 hâ1, reagent consumptions=1.9 µmol of N,N-dimethyl-p-phenylenediamine, 1.68 µg of Malachite green and 0.68 mmol Cr(VI) per determination, respectively.
Related Topics
Physical Sciences and Engineering
Chemistry
Analytical Chemistry
Authors
Claudineia R. Silva, Taciana F. Gomes, Valdemir A.F. Barros, Elias A.G. Zagatto,