Leco Corporation

Jonelle Ley Shiel

Mark Firmer Merrick

David Jesse Borton

A multi-dimensional gas chromatograph for analyzing compounds in a sample during a single run is disclosed. The multi-dimensional gas chromatograph includes a first column, a second column, and a modulator disposed between the first column and the second column. The modulator modulates at (i) a first modulation period over a first time period during the run and (ii) a second modulation period over a second time period during the run later than the first time, the second modulation period being different than the first modulation period.

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Stevensville, MI, United States of America

Jonelle Ley Shiel