Handbook of Advanced Chromatography / Mass Spectrometry Techniques
Chapter 7 - Introduction to Two-Dimensional Liquid Chromatography - Theory and Practice
by Dwight R. Stoll

Figure 7-17. Example valve interfaces used for mLC-LC, sLC x LC, and LC x LC separations. Either configuration can also be used for simple single heartcut operation (LC-LC). 1D, first dimension; 2D, second dimension; LC, liquid chromatography.

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