TY - JOUR

T1 - Vapor permeation-stepwise injection simultaneous determination of methanol and ethanol in biodiesel with voltammetric detection

AU - Shishov, Andrey

AU - Penkova, Anastasia

AU - Zabrodin, Andrey

AU - Nikolaev, Konstantin

AU - Dmitrenko, Maria

AU - Ermakov, Sergey

AU - Bulatov, Andrey

N1 - Publisher Copyright: © 2015 Elsevier B.V.

PY - 2016/2/1

Y1 - 2016/2/1

N2 - A novel vapor permeation-stepwise injection (VP-SWI) method for the determination of methanol and ethanol in biodiesel samples is discussed. In the current study, stepwise injection analysis was successfully combined with voltammetric detection and vapor permeation. This method is based on the separation of methanol and ethanol from a sample using a vapor permeation module (VPM) with a selective polymer membrane based on poly(phenylene isophtalamide) (PA) containing high amounts of a residual solvent. After the evaporation into the headspace of the VPM, methanol and ethanol were transported, by gas bubbling, through a PA membrane to a mixing chamber equipped with a voltammetric detector. Ethanol was selectively detected at +0.19 V, and both compounds were detected at +1.20 V. Current subtractions (using a correction factor) were used for the selective determination of methanol. A linear range between 0.05 and 0.5% (m/m) was established for each analyte. The limits of detection were estimated at 0.02% (m/m) for ethanol and methanol. The sample throughput was 5 samples h-1. The method was successfully applied to the analysis of biodiesel samples.

AB - A novel vapor permeation-stepwise injection (VP-SWI) method for the determination of methanol and ethanol in biodiesel samples is discussed. In the current study, stepwise injection analysis was successfully combined with voltammetric detection and vapor permeation. This method is based on the separation of methanol and ethanol from a sample using a vapor permeation module (VPM) with a selective polymer membrane based on poly(phenylene isophtalamide) (PA) containing high amounts of a residual solvent. After the evaporation into the headspace of the VPM, methanol and ethanol were transported, by gas bubbling, through a PA membrane to a mixing chamber equipped with a voltammetric detector. Ethanol was selectively detected at +0.19 V, and both compounds were detected at +1.20 V. Current subtractions (using a correction factor) were used for the selective determination of methanol. A linear range between 0.05 and 0.5% (m/m) was established for each analyte. The limits of detection were estimated at 0.02% (m/m) for ethanol and methanol. The sample throughput was 5 samples h-1. The method was successfully applied to the analysis of biodiesel samples.

KW - Biodiesel

KW - Cyclic voltammetry

KW - Ethanol

KW - Flow analysis

KW - Methanol

KW - Vapor permeation

UR - http://www.scopus.com/inward/record.url?scp=84949087800&partnerID=8YFLogxK

U2 - 10.1016/j.talanta.2015.05.041

DO - 10.1016/j.talanta.2015.05.041

M3 - Article

C2 - 26653499

AN - SCOPUS:84949087800

VL - 148

SP - 666

EP - 672

JO - Talanta

JF - Talanta

SN - 0039-9140

ER -