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Chromatographic Detectors Design Function and Operation by Raymond P.W. Scott

By Raymond P.W. Scott

Written via a pro chromatographer with extra that forty years, adventure within the box, this reference comprehensively covers the layout, development, and operation of fuel chromatography (GC), liquid chromatography (LC), and thin-layer chromatography (TLC) detectors--all in a single handy, up to date resource.

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It could be argued that the manufacturer of the detector should not be held responsible for the precise control of the mobile phase, beitmay a gas flow controller or a solvent pump. However, all mobile phase delivery systems show some variation in flow rates (and consequently pressure) and it is the responsibility of the detector manufacturer to design devices that are as insensitive to pressure and flow changes as possible. It should be noted that at the high sensitivity range settings of some detectors, filter circuits are automatically introduced to reduce the noise.

Html 01/06/2004 Document Página 1 de 1 Page 19 Figure 1 The Different Forms of Detector Response All proportional detectors are designed to provide a response that is as close to linear as possible in order to facilitate calculation procedures in quantitative analysis. In many detectors the output from the detector sensor is not linearly elated to the solute concentration, in which case appropriate signal modifying circuits must be used to furnish a linear output. For example the output from a light adsorption sensor will be exponential and consequently it must be used with a logarithmic amplifier to produce an output that is linearly related to solute concentration.

253(1982)159. 6. D. H. Desty, "Gas Chromatography, 1958" (ed. D. H. Desty) Butterworths, London (1958)126. 7. R. P. W. Scott and P. Kucera, J. , 169(1979)51. 8. R. P. W. Scott and J. G. Lawrence, Anal. , 39(1967)830. 9. A. Klinkenberg, "Gas Chromatography 1960" (Ed. W. Scott), Butterworths, London,(1960)194. 10. R. P. W. Scott, "Liquid Chromatography Column Theory", John Wiley and Sons, New York, (1992) 26. 11. R. P. W. Scott, "Liquid Chromatography Column Theory", John Wiley and Sons, New York, (1992) 109.

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