Gas Chromatography Blog

Split Sample Introduction – Part 1: Background and Split Ratio

This technical article introduces the split sample concept and things to take note of for the best analytical results possible.

Anyone who analyses samples by capillary gas chromatography has most likely used a split inlet. Although simple in concept, there are a few things to keep in mind to get the best analytical results possible.
Split inlets were invented to address the issues originally faced with the invention and adoption of capillary columns. Wall coated open tubular (WCOT) capillary columns offer much higher plate count, and, therefore, much higher separation power than the previously used packed column counterparts. However, they suffer from two major deficiencies: lower capacity and the need to produce narrow initial band widths even though the column flow-rate is low.

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