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5 Detectors The detector must be heated to avoid condensation of components eluted from the column, and generally the detector temperature is kept at least 20  C above the highest column temperature. A large variety of GC detectors exist, both selective and more universal detectors. Only a few, but the most used, detectors are described in some detail in this book. Detectors can be classified as mass- or concentration-sensitive detectors. The chromatographic peak area using a mass-sensitive detector is independent of the flow rate used, while the peak area using a concentration-sensitive detector depends on the flow rate.

2 Solvents and Solvent Delivery The conventional HPLC piston pumps deliver the mobile phase (also called eluent) from one or two pumps, each with one or two pump heads, with a Chromatography: Basic Principles, Sample Preparations and Related Methods, First Edition. Elsa Lundanes, Leon Reubsaet and Tyge Greibrokk. Ó 2014 Wiley-VCH Verlag GmbH & Co. KGaA. Published 2014 by Wiley-VCH Verlag GmbH & Co. KGaA.

However, on-column injection provides repeatable injections without discrimination, and is thus well suited for high-boiling compounds. 4 Large-Volume Injectors Larger volumes of samples can be introduced to the column using programmed temperature vaporizing (PTV) injector. The PTV injector resembles the split/ splitless injector, but the vaporization chamber (liner) can be heated and cooled rapidly. This is obtained using a liner with low thermal mass. The sample is introduced at a low initial temperature, eliminating the problem of discrimination and thermal degradation associated with the conventional split/splitless injection.

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