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• W3146076574 abstract "correct evaluation of separation columns, capillary columns, their interconnections and the dosage technique is important in gas chromatography as well as in l iquid chromatographic methods. The conventional, theoretical plate number or plate height and their corresponding effective values (effective plate number or effective plate height) represent the combined action of column quality, interconnections and dosage, rather than their individual contributions to the overall performance of the separation system. Since these chromatographic criteria are dependent on the nature of the sample and the methods, a directed improvement or selective evaluation is not possible. A new evaluation system and method of measurement with the following characteristics is proposed: 1. Substance independent, L e., independent of the chromatographic position. 2. Real evaluation of a separation column. 3. Individual, quantitative evaluation and measurement of factors which have a negative influence on the overall performance of a separation system, such as dosage, interconnections and detector. 4. A meaningful correlation between the basic factors, which determine the separation capability and the separation power. The real plate number nreal the real plate height hreal the dosage and interconnection quality Qs the separation number TZreal the separation power number TZt and:the independent optimization of these fact'ors, with respect to a maximum separation allow a correct, comparative evaluation of entirely different chromatographic separation systems. Such an evaluation requires three to eight data pairs, consisting of (correctly measured) peak width and retention data and a statistical regression calculation or interand extrapolating by plotting. The measurements and calculations can be carried out within 5 minutes. Highly conclusive evaluation factors (which must be statistically secured by additional calculations) are obtained. The basic evaluation procedures will be explained, and examples will be given for the method o f measurement, the calculation and plotting techniques. (programs for the Hewlett-Packard calculator HP-67 or 97 is provided.) Applications wil l be discussed for conventionally packed columns, extremely short or long micropacked columns, and thin fi lm capillaries. Part 2 deals with adaptation of the method to l iquid column chromatography, and part 3 discusses the application of the method to high performance and normal layer chromatography as well as a comparison of the methods. It is often claimed, that the theoretical plate number is 'theoretically dependent on k and that the air peak (in GC) cannot be used to evaluate the quafity of a chromatogram. This is an interpretation error or a misunderstanding of the method of measurement and wil l be discussed in depth, thus the basis of the new method can be criticafly compared and examined with the conventional evaluation method. The derivations are designed in such a way, that newcomers in the field, wil l be able to apply th'e method. The theoretical background of this paper is discussed in Chromatographia 1976 and 1977." @default.
• W3146076574 created "2021-04-13" @default.
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• W3146076574 date "2005-01-01" @default.
• W3146076574 modified "2023-09-23" @default.
• W3146076574 title "The Correct Measurement and Interpretation of Evaluation Factors in Chromatography: The Real Plate Number, the Separation Number, the Dosage quality, r Part 1 : Gas Chromatography" @default.
• W3146076574 hasPublicationYear "2005" @default.
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