Read e-book online Advances in Chromatography: Volume 41 PDF

By Phyllis R. Brown, Eli Grushka

ISBN-10: 0824705092

ISBN-13: 9780824705091

An updated reference, delivering an leading edge viewpoint on breakthroughs in separation technology, reminiscent of reverse-phase HPLC, advances in hyphenation, and linear dependence of relative retention values at the nature of the provider fuel and common column strain in gas-liquid chromatography.

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Extra info for Advances in Chromatography: Volume 41

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1) retains its validity if an open capillary is replaced by a porous plug [20]. Fig. 3 Generation of electroosmotic flow in a packed capillary. Fundamentals of Capillary Electrochromatography / 7 Fig. 4 Comparison of chromatograms obtained for the separation of neutral solutes with a packed (top trace) polyvinylalcohol-coated fused-silica capillary or a (mirror trace) bare fused-silica capillary. Capillary, 335 (250) mm ϫ 100 µm; stationary phase, 3-µm porous octadecyl silica gel (CEC Hypersil C18); mobile phase, 80% acetonitril, 20% aqueous buffer (25 mmol/L TRISHCl, pH 8); temperature ϭ 20°C; 1 ϭ thiourea, 2 ϭ ethyl paraben, 3 ϭ propyl paraben, 4 ϭ butyl paraben, 5 ϭ pentyl paraben, 6 ϭ naphthalene, 7 ϭ hexyl paraben, 8 ϭ fluorene, 9 ϭ anthracene, 10 ϭ anthracene, 11 ϭ fluoranthene.

10 the dependence of the peak width at half-height in length units on the injected plug length calculated according to Eq. (14) (ks ϭ 0) for alkyl- and arylbenzoates as test solutes is presented for a packed column [N(maximum) ϭ 43,000–52,000, length to the detector ϭ 258 mm]. The experimentally determined dependence of the peak width at half-height on the injected plug length corresponds to the curve predicted by theory. At low injected plug length (LI Յ 1 mm), wh is independent of LI , while at high volume overload wh is linearly increased with LI .

The difference between CEC and CE in terms of optical detection is the fact that with CEC detection can be performed either in the chromatographic bed itself containing the stationary and the mobile phase (in-column detection, ICD) or in an open section of the separation capillary containing only the eluate (on-column detection, OCD). The terminology differing between these two detection modes was suggested in 1987 by Verzele and Dewaele [134]. In Fig. 2 the realization of these two detection modes is illustrated using a packed capillary as an example.

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Advances in Chromatography: Volume 41 by Phyllis R. Brown, Eli Grushka

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