Nonfiction 1

Open Tubular Columns in Gas Chromatography by L. S. Ettre (auth.)

By L. S. Ettre (auth.)

For my prior sins, Leslie Ettre has given me the privilege of writing a number of phrases to preface his first-class little publication. It provides me nice excitement to take action, end result of the decades of fruitful collabo­ ration we've got had at Perkin-Elmer, since it is fresh to determine a treatise in gasoline chromatography during which the theoretical remedy has been bared to its necessities, and not using a mushrooming of formulae which, via an ever expanding variety of parameters, account for progressively more, and clarify much less and not more, and as the writer has well-known that the gasoline chromatographic column is a virtually passive aspect in its personal correct which merits to have a treatise written approximately solely approximately it, simply as electric circuit thought might be mentioned with no intricate references to hoover tubes and meters. I want this carefully written quantity the good fortune it merits. M. J. E. GOLAY VII Preface gasoline chromatography is a separation procedure used essentially in analytical chemistry. hence, it really is obtrusive that specified emphasis could be put on that individual a part of the equipment within which the separation occurs. This half is the column, the guts of the gasoline chromatograph. The target of researchers within the box of gasoline chromatography has been-from the beginning-to comprehend the separation method in order that they may perhaps layout columns with the absolute best functionality. Such research led M. J. E.

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Open Tubular Columns in Gas Chromatography

For my earlier sins, Leslie Ettre has given me the privilege of writing a number of phrases to preface his first-class little booklet. It offers me nice excitement to take action, due to the a long time of fruitful collabo­ ration we've had at Perkin-Elmer, since it is clean to work out a treatise in fuel chromatography during which the theoretical therapy has been bared to its necessities, with out a mushrooming of formulae which, by way of an ever expanding variety of parameters, account for increasingly more, and clarify much less and no more, and as the writer has famous that the gasoline chromatographic column is an almost passive point in its personal correct which merits to have a treatise written approximately completely approximately it, simply as electric circuit concept may be mentioned with no difficult references to hoover tubes and meters.

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55 I I Utilized fraction of theoretically best performance. HETP. 0 b I HETP m1n , I ! I i 0 " , I I ~ -- 40 21 18 'The corresponding chromatograms and analysis conditions are given in Figures 5-7. b Extrapolated values. 2 19 Practical Conclusions from the Golay Equation ® ® ® ® CD ® •

In Gas Chromatography 1958, cd. D. H. Desty. Butterworths, London, 1958. pp. 189-199. 52 Theory and Practice (t R) in the calculation of column efficiency. Desty et al. 54 (t'~)2 = n(k)2 -Wh CD CAPACITY k + 1 (46) k ki'l RATIO Figure 22. Plot of [k/(k + 1)] and [kl(k + 1)1' against the capacity ratio (k). 5. For numerical values see Table I. In packed columns, k is usually fairly large; thus, as seen in Figure 22 [k/(k + 1)]2 approaches unity and, therefore, N:::,: n. With open tubular columns, if k is small, N is only a fraction of n.

But already very early in the development of open tubular columns was it shown that they can solve this problem much more easily, even if coated with a nonspecific phase. 25 mm ID column prepared with dinonyl phthalate liquid phase. No practical packed column prepared with either phase would separate these two isomers. A third author who demonstrated the successful application of 34 Theory and Practice a standard nonspecific stationary phase for the solution of this problem is Schreyer [239]. 30 mm ID open tubular column coated with squalane.

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