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Sequential spectrofluorimetric determination of free and total glycerol in biodiesel in a multicommuted flow system

Silva, Sidnei G. ; Morales-Rubio, Ángel ; de La Guardia, Miguel ; Rocha, Fábio R. P.

Analytical and bioanalytical chemistry, 2011-07, Vol.401 (1), p.365-371 [Periódico revisado por pares]

Berlin/Heidelberg: Springer-Verlag

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Título:
Sequential spectrofluorimetric determination of free and total glycerol in biodiesel in a multicommuted flow system
Autor: Silva, Sidnei G. ; Morales-Rubio, Ángel ; de La Guardia, Miguel ; Rocha, Fábio R. P.
Assuntos: Acetylacetone ; Analysis ; Analytical Chemistry ; Biochemistry ; Biodiesel ; Biodiesel fuels ; Biofuels - analysis ; Characterization and Evaluation of Materials ; Chemistry ; Chemistry and Materials Science ; Coefficient of variation ; Equipment Design ; Exact sciences and technology ; Flow Injection Analysis - instrumentation ; Flow Injection Analysis - methods ; Food Science ; Formaldehyde ; Glycerin ; Glycerol ; Glycerol - analysis ; Glycerols ; Laboratory Medicine ; Limit of Detection ; Monitoring/Environmental Analysis ; On-line systems ; Original Paper ; Sampling ; Sodium ; Solenoids ; Spectrometric and optical methods ; Spectrometry, Fluorescence - instrumentation ; Spectrometry, Fluorescence - methods
É parte de: Analytical and bioanalytical chemistry, 2011-07, Vol.401 (1), p.365-371
Notas: ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
Descrição: A new procedure for spectrofluorimetric determination of free and total glycerol in biodiesel samples is presented. It is based on the oxidation of glycerol by periodate, forming formaldehyde, which reacts with acetylacetone, producing the luminescent 3,5-diacetyl-1,4-dihydrolutidine. A flow system with solenoid micro-pumps is proposed for solution handling. Free glycerol was extracted off-line from biodiesel samples with water, and total glycerol was converted to free glycerol by saponification with sodium ethylate under sonication. For free glycerol, a linear response was observed from 5 to 70 mg L −1 with a detection limit of 0.5 mg L −1 , which corresponds to 2 mg kg −1 in biodiesel. The coefficient of variation was 0.9% (20 mg L −1 , n = 10). For total glycerol, samples were diluted on-line, and the linear response range was 25 to 300 mg L −1 . The detection limit was 1.4 mg L −1 (2.8 mg kg −1 in biodiesel) with a coefficient of variation of 1.4% (200 mg L −1 , n = 10). The sampling rate was ca. 35 samples h −1 and the procedure was applied to determination of free and total glycerol in biodiesel samples from soybean, cottonseed, and castor beans.
Editor: Berlin/Heidelberg: Springer-Verlag
Idioma: Inglês

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Sequential spectrofluorimetric determination of free and total glycerol in biodiesel in a multicommuted flow system

Silva, Sidnei G. ; Morales-Rubio, Ángel ; de La Guardia, Miguel ; Rocha, Fábio R. P.

Berlin/Heidelberg: Springer-Verlag

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