Determination of potassium in fatty acid methyl esters applying an ion-selective potassium electrode

P. Rapta 1 , J. Paligová 1 , H. Rotheneder 2  and J. Cvengroš 1
  • 1 Department of Physical Chemistry, Faculty of Chemical and Food Technology, Slovak University of Technology, Radlinského 9, 812 37, Bratislava, Slovak Republic
  • 2 BDT, Hietzinger Hauptstr. 50, 1130, Vienna, Austria

Abstract

An easy and inexpensive method of potassium determination in fatty acid methyl esters (FAME) applying an ion-selective potassium electrode (ISE-K) is presented. FAME are considered alternative fuel for diesel engines. Simple apparatus and procedure were developed to avoid contact of ester samples with the sensitive ISE-K membrane, which can damage the ISE membrane surface in long time operation. Using different FAME samples with a wide range of known potassium content a calibration curve was constructed. Among all samples, ISE-K satisfactory predicted potassium content in FAME as identified by the AAS reference method.

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