A multi-purpose flow manifold for the spectrophotometric determination of sulphide, sulphite and ethanol involving gas diffusion: Application to wine and molasses analysis

Autor(es)

Silva, Claudineia R. ^[1] ; Gomes, Taciana F. ^[1] ; Barros, Valdemir A. F. ^[1] ; Zagatto, Elias A. G. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Ctr Nucl Energy Agr, Res Support Ctr Technol & Innovat Sustainable Agr, BR-13400970 Piracicaba, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Talanta; v. 113, p. 118-122, SEP 15 2013.
• Citações Web of Science: 7

Resumo

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 mgL(-1)S(2-), 2.5-20.0 mg L-1 SO3- and 5.0-25.0% (v/v) of ethanol; detection limits (3 sigma)=0.035 mg L-1 S2-, 0.2 mg L-1 SO3- and 0.18% (v/v) of ethanol; peak height r.s.d.=2.18% for 4.03 mg L-1 S2- spiked molasses, 2.21% for a 9.82 mg L-1 SO3- wine and 2.07% for a typical wine (12.53% v/v of ethanol), sampling rate=15, 57 and 29 h(-1), reagent consumptions=1.9 mu mol of N,N-dimethyl-p-phenylenediamine, 1.68 mu g of Malachite green and 0.68 mmol Cr(VI) per determination, respectively. (C) 2013 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 10/00972-4 - Exploração de fluxos pulsados e difusão gasosa em sistema polivalente de análises em fluxo: monitoramento de sulfeto, sulfito e etanol durante a fermentação alcoólica.
• Beneficiário: Claudineia Rodrigues da Silva
• Linha de fomento: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 11/23498-9 - Sistemas avançados de análises químicas em fluxo: aplicações nas áreas tecnológica, agronômica e ambiental
• Beneficiário: Elias Ayres Guidetti Zagatto
• Linha de fomento: Auxílio à Pesquisa - Temático