Data/hora: 13/06/2024 23:56:45

Provedor de dados: | 42
País: | Brazil
Título: | Exploiting gas diffusion for non-invasive sampling in flow analysis: determination of ethanol in alcoholic beverages
Autores: | Vicente,Simone; Zagatto,Elias A.G.; Pinto,Paula C.A.G.; Saraiva,Maria Lucia M.E.S.; Lima,José L.F.C.; Borges,Eduardo P.
Data: | 2006-03-01
Ano: | 2006
Palavras-chave: | Flow-injection analysis; Ethanol determination; Gas diffusion; Semi-permeable membrane; UVVis spectrophotometry.
Resumo: | 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 &lt; 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.&lt; 2%) and in agreement with an official procedure.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652006000100004
Editor: | Academia Brasileira de Ciências
Relação: | 10.1590/S0001-37652006000100004
Formato: | text/html
Fonte: | Anais da Academia Brasileira de Ciências  v.78 n.1 2006
Fonte: | info:eu-repo/semantics/openAccess