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By Viktor G. Berezkin

The so much common and powerful approach for the research of advanced multicomponent combinations of risky elements is gasoline chromatography. even though, there are many barriers asso­ ciated with the classical version of this method which retard its improvement and the extra enlargement of its program: 1) the identity of the parts of a posh combine­ ture of unknown composition is in itself a posh and hard challenge, until the homologous sequence of the portion of be pointed out is understood; 2) the overlapping of chromatographic peaks for a number of compounds makes it tough, and in a few instances most unlikely, to hold out qualitative and quantitative research of those parts, and ends up in the need of utilizing a number of columns of alternative polarities or to using columns with very excessive potency; three) the direct research of volatile and nonvolatile compounds is most unlikely; four) the trouble of quantitative chromatographic research utilizing thermal conductivity detectors raises with the need of opting for person reaction (calibration) elements; the insensitivity of the flame ionization detector to a couple of elements (inorganic gases) ends up in the need of introducing extra operations (prelimi­ nary focus of hint parts) in reference to thermal conductivity detectors. vii viii FOREWORD The directed use of chemical conversion of the compounds analyzed frequently makes it attainable to take away the restrictions pointed out above.

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Rowan [5] studied in detail the possibility of using hydrogenation and dehydrogenation reactions in gas chromatography for analytical purposes. He showed that it is not difficult to carry out selective hydrogenation of aromatic hydrocarbons and olefins as a group reaction. 4% platinum on aluminum oxide) containing a halogen is best for this purpose. 5 g; temperature, 299°C; flow rate of helium (hydrogen), 60-70 ml/min. Dehydrogenation is a more complex process, which is often accompanied by side reactions.

Chim. Acta, 43:489 (1960). E. Glueckauf, Trans. , 51:34 (1955). A. Klinkenberg and F. Sjenitzer, Chem. Eng. , 5:258 (1956). V. G. Berezkin, V. S. Kruglikova, and V. E. Shiryaeva, Neftekhimiya, 6:630 (1966). B. D. Blaustein and G. M. Feldman, Anal. , 36:65 (1964) . S. Z,. Roginskii and A. L. Rozental, Dokl. Akad. Nauk SSSR, 146:152 (1962). S. Z. Roginskii and A. L. Rozental, Kinetika i Kataliz, 5:104 (1964) . A. A. Zhukhovitskii and N. M. Turkel'taub, Gas Chromatography, Gostoptekhizdat, Moscow, 1962.

Therefore, in the case of a large sample, the width of the chromatographic zone after the column (1)0) will be equal to the sum of the widths of the initial zones (1)p) and a single chromatographic zone (1)B): 'YJo='YJp+'YJg" (26) Keeping in mind that H = ~(l)2 16 t (27) (where L is the column length and t is the retention time), the following approximate equation can be obtained which relates the change in the height equivalent to a theoretical plate (H) to the change in the initial width of the sample: (28) 39 REACTOR EFFECT OF CHROMATOGRAPHY Equation 28 agrees with the experimental data given by Purnell and Sawyer [33].

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