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Advisor(s)
Abstract(s)
A flow system based on the multicommutation concept was developed for the determination of free and total sulfur dioxide in table wines, exploiting gas diffusion separation and spectrophotometric detection.
The system allowed the comparison of malachite green and pararosaniline chemistries, using the
same manifold configuration. Free and total SO2 were determined within the ranges 1.00-40.0 and
25.0-250 mg L-1, at determination throughputs of 25 and 23 h-1, respectively. Employing the
malachite green reaction, detection limits of 0.3 and 0.8mgL-1 were attained for free and totalSO2, respectively.
Pararosaniline chemistry provided detection limits of 0.6 mg L-1 for free SO2 and 0.8 mg L-1
for total SO2. Relative standard deviations better than 1.8 and 1.4% were obtained by the malachite
green and pararosaniline reactions, respectively. With regard to the two tested chemistries, 18 wines
were analyzed and the results achieved by the pararosaniline reaction compared better with those
furnished by the recommended procedure.
Description
Keywords
Multicommutation Gas diffusion Spectrophotometry Sulfur dioxide Wines Malachite Green Pararosaniline
Pedagogical Context
Citation
"Journal of Agricultural and Food Chemistry". ISSN 1520-5118. 57 (2009) 3415–3422
Publisher
American Chemical Society