Exploiting gas diffusion for non-invasive sampling in flow analysis: determination of ethanol in alcoholic beverages

• Tipo: Artigo em Revista Científica Internacional
• Data: 2006

Autores

SIMONE VICENTE (Autor) Outra; ELIAS A.G. ZAGATTO (Autor) Outra; PAULA C.A.G. PINTO (Autor) FFUP; MARIA LUCIA M.E.S. SARAIVA (Autor) FFUP; JOSÉ L.F.C. LIMA (Autor) FFUP; EDUARDO P. BORGES (Autor) Outra

Revista

Título: Anais da Academia Brasileira de Ciencias

Vol. 78 Nº 1

Páginas: 23-29

ISSN: 0001-3765

Editora: Academia Brasileira de Ciencias

Indexação

ISI Web of Knowledge - 8 Citações

ISI Web of Science

Scopus - 10 Citações

Classificação Científica

FOS: Ciências médicas e da saúde > Outras ciências médicas

CORDIS: Ciências da Saúde

Outras Informações

ID Authenticus: P-005-62S

Resumo (PT): A tubular gas diffusion PTFE membrane is exploited for non-invasive sampling in flow analysis, aiming to develop an improved spectrophotometric determination of ethanol in alcoholic beverages. The probe is immersed into the sample, allowing ethanol to diffuse through the membrane. It is collected into the acceptor stream (acidic dichromate solution), leading to formation of Cr(III), monitored at 600 nm. The analytical curve is linear up to 50% (v/v) ethanol, baseline drift is < 0.005 absorbance during four working-hours, and sample throughput is 30 h−1, meaning 0.6 mmol K2Cr2O7 per determination. Results are precise (r.s.d. < 2%) and in agreement with an official procedure. <br> <br> Key words: Flow-injection analysis, ethanol determination, gas diffusion, semi-permeable membrane, UVVis spectrophotometry. <br> <a target="_blank" href="http://www.scielo.br/scielo.php?script=sci_abstract&pid=S0001-37652006000100004&lng=en&nrm=iso&tlng=pt"> Texto integral </a> <br> <br>

Abstract (EN): A tubular gas diffusion PTFE membrane is exploited for non-invasive sampling in flow analysis, aiming to develop an improved spectrophotometric determination of ethanol in alcoholic beverages. The probe is immersed into the sample, allowing ethanol to diffuse through the membrane. It is collected into the acceptor stream (acidic dichromate solution), leading to formation of Cr(III), monitored at 600 nm. The analytical curve is linear up to 50% (v/v) ethanol, baseline drift is < 0.005 absorbance during four working-hours, and sample throughput is 30 h−1, meaning 0.6 mmol K2Cr2O7 per determination. Results are precise (r.s.d. < 2%) and in agreement with an official procedure. <br> <br> Key words: Flow-injection analysis, ethanol determination, gas diffusion, semi-permeable membrane, UVVis spectrophotometry. <br> <a target="_blank" href="http://www.scielo.br/scielo.php?script=sci_abstract&pid=S0001-37652006000100004&lng=en&nrm=iso&tlng=pt "> Full text</a> <br> <br>

Idioma: Português

Tipo (Avaliação Docente): Científica