High detector classification

The flame ionization detectors (as well as the other flame detectors) can be used equally well with packed and capillary columns. Different considerations may apply to other detector types. The well-known classification of chromatographic detectors into the concentration-sensitive and the mass-flow-sensitive types is highly relevant in this respect. A response enhancement [108] to the mass-flow-sensitive detector types is given as... 

A variety of sampling techniques has been tried for measuring organic vapors in exhaled air. Table 15.2.1.1 shows a classification of these techniques. The main distinction is between direct reading instruments and transportable samples that require analysis in the laboratory. The former group covers the widest range, from simple detector tubes to High Resolution Mass Spectrometry. 

The slow development of LC from the time of Tswett, to the late 1950 s was entirely due to the lack of high sensitivity on-line detectors. Since, the inception of effective LC detectors there has been a continuous synergistic interaction between column development and detector development which has resulted in the present highly sophisticated LC systems of today. There are a number of ways of classifying LC detectors, specific and non-specific detectors, mass and concentration sensitive detectors and finally bulk property and solute property detectors. The classification of detectors as bulk property and solute property detectors is recommended. Bulk property detectors respond to a change in some overall property of the eluent such as refractive index or dielectric constant whereas solute property detectors respond to some property that is unique to the solute alone. In practice solute property detectors are rarely ideal and many respond, at least weakly, to the same property of the mobile phase as well as the solute. 

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