Abstract:
A method and apparatus for two-dimensional gas chromatography (GC), including a valve having first and second positions (P, and P), and first through fourth sample flow paths (FP-FP). In P, a first gas sample is collected from a first dimension GC column via FP, a first pressure source and a first, second dimension GC column are connected via FP, a second pressure source and a second, second dimension GC column are connected via FP, and FP is disconnected. In P, the first sample in FP is introduced to the second, second dimension GC column via FP, with aid of the second pressure source, a second gas sample is collected from the first dimension GC column via FP, the first pressure source and the first, second dimension GC column via FP are connected, and FP is disconnected.