Autor(es): Delfino, Jose Rodrigues ; Pereira, Thulio C. ; Costa Viegas, Helmara D. ; Marques, Edmar P. ; Pupim Ferreira, Antonio A. [UNESP] ; Zhang, Lei ; Zhang, Jiujun ; Brandes Marques, Aldalea L.
Data: 2018
Identificador Persistente: http://hdl.handle.net/11449/160064
Origem: Oasisbr
Assunto(s): Water content; Electrochemical impedance spectroscopy; Biodiesel
Made available in DSpace on 2018-11-26T15:47:22Z (GMT). No. of bitstreams: 0 Previous issue date: 2018-03-01
FAPEMA
Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
ANP
FINEP
In this paper, a fast, simple and new alternative method for determination of water content (moisture) in biodiesel using electrochemical impedance spectroscopy (EIS) is developed. The method is based on the sensitive variation of the charge transfer resistance (R-ct) of the biodiesel medium in the presence of different quantities of water. To obtain an accurate analytical measurement, a pre-treatment based on a simple dilution by acetonitrile is employed. The two identical Pt electrodes are used in the measurement cell filled with sample solution. The experiment conditions are also optimized for the measurements. The obtained analytical linear curve between the water content and EIS impedance is the basis for the water content analysis in biodesiel fuel. The EIS method is then successfully applied to both real and certified samples, and the results confirm that the method is reliable with high sensitivity, precision and accuracy. The comparison of EIS method with the official standard method is also made through the Student test t, demonstrating that both methods are statistically consistent and similars. The validation of such an EIS method confirms that the method presented for the fist time in this paper can be succesessfully applied to determining the water content of biodiesel fuel.
Fed Univ Maranhao UFMA, Nucleus Studies Petr & Energy NEPE, LPQA, Ave Portugueses 1966, BR-65080040 Sao Luis, MA, Brazil
Sao Paulo State Univ Julio de Mesquita Filho, Inst Chem, BR-14801970 Araraquara, SP, Brazil
Shanghai Univ, Coll Sci, Shanghai 200444, Peoples R China
Shanghai Univ, Inst Sustainable Energy, Shanghai 200444, Peoples R China
Sao Paulo State Univ Julio de Mesquita Filho, Inst Chem, BR-14801970 Araraquara, SP, Brazil
FAPEMA: UNIVERSAL-00799/14
FAPEMA: INFRA-03578/13
CNPq: 2014 - 4
CNPq: PQ 2014
ANP: 1,029 / 2016-ANP-007,639
FINEP: 2644/09
FINEP: 0110078404
FINEP: RECOL 05
