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Titolo:
PROFILES OF LARGE-SIZE SYSTEM PEAKS AND VACANCY BANDS IN LIQUID-CHROMATOGRAPHY .1. ANALYTICAL SOLUTION OF THE IDEAL MODEL
Autore:
ZHONG GM; FORNSTEDT T; GUIOCHON G;
Indirizzi:
UNIV TENNESSEE,DEPT CHEM KNOXVILLE TN 37996 UNIV TENNESSEE,DEPT CHEM KNOXVILLE TN 37996 OAK RIDGE NATL LAB,DIV ANALYT CHEM OAK RIDGE TN 37831
Titolo Testata:
Journal of chromatography
fascicolo: 1, volume: 734, anno: 1996,
pagine: 63 - 74
Fonte:
ISI
Lingua:
ENG
Soggetto:
PAIR ADSORPTION CHROMATOGRAPHY; ELUTION PROFILES; BINARY ELUENT; MOBILE-PHASE; RESPONSE MODELS; COMPRESSION; RETENTION; IONS;
Keywords:
SYSTEM PEAKS; VACANCY BANDS; PREPARATIVE CHROMATOGRAPHY; BAND PROFILES;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
37
Recensione:
Indirizzi per estratti:
Citazione:
G.M. Zhong et al., "PROFILES OF LARGE-SIZE SYSTEM PEAKS AND VACANCY BANDS IN LIQUID-CHROMATOGRAPHY .1. ANALYTICAL SOLUTION OF THE IDEAL MODEL", Journal of chromatography, 734(1), 1996, pp. 63-74

Abstract

Often in chromatography, a compound which participates in the retention mechanism is added to the mobile phase, This permits control of theretention factors of the analytes and allows their indirect detection. Injection of large volumes of solutions having a composition different from that of the mobile phase causes perturbation of the equilibrium between the two phases of the chromatographic system, and may resultin large positive or negative system peaks when the additive signal is monitored, If the equilibrium behavior is accounted for by competitive Langmuir isotherms, the positive bands, which contain an excess of the additive, are Langmuirian-shaped as in the classical elution case,while the large vacancy bands have an anti-Langmuirian profile. An explicit analytical solution is derived within the framework of the ideal model for the profiles of large-size pulses and vacancies. This solution permits the easy calculation of the retention times of the different parts of the bands, i.e., of its shocks and diffuse boundaries. This solution provides also a more profound explanation of the formationof the large system peaks than available so far and of their distinctive properties as compared to those of large-size bands in classical elution.

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Documento generato il 15/07/20 alle ore 13:26:41