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

• Type: Article in International Scientific Journal
• Date: 2006

Authors

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

Journal

Title: Anais da Academia Brasileira de Ciencias

Vol. 78 No. 1

Pages: 23-29

ISSN: 0001-3765

Publisher: Academia Brasileira de Ciencias

Indexing

ISI Web of Knowledge - 8 Citations

ISI Web of Science

Scopus - 10 Citations

Scientific classification

FOS: Medical and Health sciences > Other medical sciences

CORDIS: Health sciences

Other information

Authenticus ID: 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>

Language: Portuguese

Type (Professor's evaluation): Scientific