By Phyllis R. Brown, Eli Grushka
An updated reference, supplying an leading edge standpoint on breakthroughs in separation technological know-how, equivalent to reverse-phase HPLC, advances in hyphenation, and linear dependence of relative retention values at the nature of the service gasoline and standard column strain in gas-liquid chromatography.
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Extra info for Advances in Chromatography: Volume 41
8), featuring efficiencies of Ͼ500,000 plates/m. Dadoo et al. 5-µm nonporous octadecyl silica gel to achieve rapid separations with high efficiencies. A sample containing 16 polycyclic aro- Fig. 8 CEC separation of explosives. 5-µm nonporous octadecyl silica gel; mobile phase, 20% methanol, 80% aqueous buffer (10 mmol/L MES, 5 mmol/L SDS); HMX ϭ octahydro-1,3,5,7-tetranitro-1,3,5,7-tetrazocine, RDX ϭ hexahydro-1,3,5trinitro-1,3,5-triazine, DNB ϭ 1,3-dinitrobenzene, TNB ϭ 1,3,5-trinitrobenzene, NB ϭ nitrobenzene, TNT ϭ 2,4,6-trinitrotoluene, 2,4-DNT ϭ 2,4-dinitrotoluene, tetryl ϭ methyl-2,4,6-trinitrophenylnitramine, 2,6-DNT ϭ 2,6-dinitrotoluene, 2-Am-DNT ϭ 2-amino-4,6-dinitrotoluene, 2-NT ϭ 2-nitrotoluene, 4-NT ϭ 4-nitrotoluene, 4-Am-DNT ϭ 4-amino-2,6-dinitrotoluene, 3-NT ϭ 3-nitrotoluene.
19): SI /SO ϭ (1 ϩ k) ϕM (19) Fundamentals of Capillary Electrochromatography / 35 where SI ϭ sensitivity for in-column detection, SO ϭ sensitivity for on-column detection, k ϭ retention factor, and ϕM ϭ volume fraction of mobile phase in the chromatographic bed. The validity of this equation was demonstrated experimentally . Figure 13 compares chromatograms of the same sample obtained with ICD or OCD. All other experimental conditions except the location of the detection window were kept constant.
These theoretical 14 / Pyell predictions have been corroborated by experimental results of Knox and Grant , Smith and Evans , and Robson et al. , who reported reduced plate heights h around 1 for retarded solutes. Some workers have demonstrated that with the same column (under identical conditions), a significantly better efficiency was obtained in the CEC mode than in the pressure-driven mode [18,34–37]. It can be concluded from these studies that with the so-called pseudo-electrochromatography  or pressurized-flow electrochromatography , a technique that uses a mixture of pressure-induced and electrokinetically induced flow, the chromatographic efficiency will be worse than with systems that use only electroosmosis for propulsion of the mobile phase.
Advances in Chromatography: Volume 41 by Phyllis R. Brown, Eli Grushka