By Jack Cazes
This identify offers a finished review of the rules, tools and basic theories utilized in the separation, quantification and research of person compounds and elements. It identifies fresh advances, mathematical relationships and important layout concepts for optimum method operation and keep watch over of chemical and chromatographic strategies.
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Extra resources for Chromatography Theory (Chromatographic Science, 88)
Zhu, Chromatographia, 20(1985)425. 6. J. H. Knox and R. J. Kaliszan, J. , 349(1985)211. 7. R. J. Smith and C. S. Nieass, J . Liq. , 9(1986)1387. 8. R. P. W. Scott and P. Kucera, J . , 149(1978)93. 9. R. M. McCormick and B. L. Karger, Anal. , 52(1980)2249. 10. R. P. W. Scott and C. F. Simpson, Faraday Symp. Chem. , 15(1980)69. 11. A. Alhedai, D. E. Martire and R. P. W. Scott, Analyst, 114(1989)869. Copyright © 2002 by Marcel Dekker, Inc. All Rights Reserved MARCEL DEKKER, INC. 270 Madison Avenue, New York, New York 10016 12.
Under these circumstances, the magnitude of the retention volume will be of the same order of magnitude as the dead volume, or considerably less, and so any errors involved in dead volume measurement will cause serious errors in the values taken for the corrected retention volume. The dead volume is made up of a number of different parts of the actual column volume, and the distribution of the total column volume into those parts of chromatographic significance can be very complex. The composition and measurement of the dead volume have been the subject of a number of investigations [4-101.
It would seem that about 70% of the column volume is occupied by mobile phase but only about 50% of that mobile phase is actually moving. About 18%of the mobile phase is interstitial, but static, and about 31% of the mobile phase is contained within the pores and is also static. Just over 6% of the mobile phase in the pores has a different composition to that of the mobile phase proper and thus constitutes a second stationary phase. There is good agreement between the different methods of measuring the thermodynamic dead volume.
Chromatography Theory (Chromatographic Science, 88) by Jack Cazes