A flow injection procedure based on solenoid micro-pumps for spectrophotometric determination of free glycerol in biodiesel

TALANTA

卷:83

Article

Silva, Sidnei G.²  Rocha, Fabio R. P.¹ 

[1] Univ Sao Paulo, Ctr Energia Nucl Agr, BR-13400970 Piracicaba, SP, Brazil

[2] Univ Sao Paulo, Inst Quim, BR-05513970 Sao Paulo, Brazil

关键词: Flow analysis;    Multicommutation;    Solenoid micro-pumps;    Biodiesel;    Glycerol;   

DOI  :  10.1016/j.talanta.2010.09.061

来源: Elsevier

【 摘 要 】

A flow system designed with solenoid micro-pumps is proposed for fast and greener spectrophotometric determination of free glycerol in biodiesel. Glycerol was extracted from samples without using organic solvents. The determination involves glycerol oxidation by periodate, yielding formaldehyde followed by formation of the colored (3,5-diacetil-1,4-dihidrolutidine) product upon reaction with acetylacetone. The coefficient of variation, sampling rate and detection limit were estimated as 1.5% (20.0 mg L-1 glycerol, n =10), 34 h(-1), and 1.0 mg L-1 (99.7% confidence level), respectively. A linear response was observed from 5 to 50 mg L-1, with reagent consumption estimated as 345 mu g of KIO4 and 15 mg of acetylacetone per determination. The procedure was successfully applied to the analysis of biodiesel samples and the results agreed with the batch reference method at the 95% confidence level. (C) 2010 Elsevier B.V. All rights reserved.

【 授权许可】

Free