Thermal modulator array for analyte modulation and comprehensive two-dimensional gas chromatography
Date
2003-01
Authors
Burger, B. V.
Snyman, Tertia
Burger, Wina J. G.
Van Rooyen, Willie F.
Journal Title
Journal ISSN
Volume Title
Publisher
Wiley-VCH Verlag
Abstract
Segmented thermal modulators were fabricated for the modulation of column effluent
in one-dimensional gas chromatography, comprehensive two-dimensional gas chromatography,
and as sample introduction devices in other analytical techniques. Thermal
desorption of analytes from the modulator was achieved by computer-controlled
application of large DC currents at low voltages sequentially to consecutive segments
or stages of the modulator heaters for periods between 100 and 400 ms per segment.
This procedure produced sharply focussed analyte peaks. Unsegmented heaters and
heaters having 2, 4, 6, 8, and 10 segments or stages were compared with respect to
their focusing efficiency. The 10-stage heater was found to give sharper focusing
than heaters with a smaller number of segments. Analyte pulses with peak widths at
half-height of ca. 150 ms were generated by the 10-stage heater. The application of a
10-stage modulator in a comprehensive two-dimensional analysis of a light petroleum
condensate gave results of acceptable quality.
Description
The original publication is available at http://onlinelibrary.wiley.com/doi/10.1002/jssc.200390002/abstract
Keywords
Thermal modulators, Gas chromatography
Citation
Burger, B. V., Snyman, T., Burger, W. J. G. & Van Rooyen, W. F. 2003. Thermal modulator array for analyte modulation and comprehensive two-dimensional gas chromatography. Journal of separation science , 26(1-2):123-128, doi:10.1002/jssc.200390002.