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Issue 20, 2014
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Characterization of selected oxidation inhibitors in transformer oils by multidimensional gas chromatography with capillary flow technology

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Abstract

Oxidation inhibitors such as 2,6-ditertiary-butyl-para-cresol (DBPC, also known as butylated hydroxytoluene) and 2,6-ditertiary-butyl phenol (DBP) are used in transformer oils to prevent radical auto-oxidation of hydrocarbon species in the oil, prolonging the transformer's life. Routine monitoring of these compounds is recommended as a diagnostic tool for measuring the health of the transformer. Typically these compounds are analyzed by spectroscopic methods or gas chromatography with extensive sample preparation steps. A multidimensional gas chromatographic method using a Capillary Flow Technology (CFT) planar microfluidic device and a Deans switch is demonstrated to analyze these compounds in the oil matrix. The two oxidation inhibitors are separated from the matrix on the analytical column and can be easily identified and distinguished from each other. Practical limits of detection were established at 25 ppm (w/w) of each inhibitor, which are well below warning and action limits of these compounds. These compounds produced a linear calibration curve over the concentration range found in transformer oils. Relative standard deviations of area for each compound were determined to be below 1.5% at the 95% confidence level (n = 10).

Graphical abstract: Characterization of selected oxidation inhibitors in transformer oils by multidimensional gas chromatography with capillary flow technology

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Publication details

The article was received on 06 May 2014, accepted on 15 Jul 2014 and first published on 16 Jul 2014


Article type: Paper
DOI: 10.1039/C4AY01073F
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Anal. Methods, 2014,6, 8136-8140

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    Characterization of selected oxidation inhibitors in transformer oils by multidimensional gas chromatography with capillary flow technology

    T. Hayward, R. Gras and J. Luong, Anal. Methods, 2014, 6, 8136
    DOI: 10.1039/C4AY01073F

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