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  • 1
    Electronic Resource
    Electronic Resource
    Rapid reversed-phase chromatographic separation and determination of selenum and tellurium (1989)
    Springer
    Chromatographia 27 (1989), S. 292-296 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Selenium(IV)-tellurium(IV) separation ; Flow-through coulometric detector
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The chromatographic behaviour of selenium and tellurium has been investigated with two different reversed-phase chromatographic methods, using P-350 (methyl-bi-isooctyl phosphate) and TBP (tributyl phosphate) as the stationary phases. HCl, HBr, NaCl and NaBr were employed as mobile phase components in both methods. The results suggested that the separation mechanism corresponds to the formation of TeCl (or TeBr) and P-350H (or TBPH) ion associate. A coulometric flow-through detector was applied to determine Se(IV) and Te(IV). Complete separation and quantitative determination of Se and Te could be achieved in 10 minutes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02321271
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Phenylalanine as eluent for indirect photometric detection (1990)
    Springer
    Chromatographia 29 (1990), S. 131-134 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Ion chromatography ; Indirect photometric detection ; Phenylalanine ; Alkali metals
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary In this paper the use of phenylalanine as eluent for indirect photometric chromatography is reported. The effects of the mobile phase pH, phenylalanine concentration etc. on the eluent strength and the sensitivity of detection are discussed. Using 3 mM aqueous solution of phenylalanine at pH 3.0 containing 1% methanol as the mobile phase, a mixture of alkali metals was separated and sodium ion concentration in water was determined on a low-capacity cation-exchange column.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02268698
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Study on the relationship between retention behavior and molecular structure parameters of substituted benzene derivatives in RPLC (1996)
    Springer
    Chromatographia 42 (1996), S. 43-48 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Substituted benzenes ; Solubility parameter ; Substituent constant
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary A quantitative structure-retention model derived from the concept of hydrophobic substituent constant (π) and the total solubility parameter (δT) has been established. It has been used to predict successfully the retention behavior of a number of solutes on various columns in several different eluents. The experimental results indicate that the model can be employed for the prediction of retention of substituted benzenes in a large volume fraction range of mobile phase. In addition, the physical meaning of the sign and the influence of the coefficients of the model on the retention process had been discussed together with the dependence of these coefficients on the composition of mobile phase.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02271054
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Relationship between retention behavior and molecular structure in HPLC. Correlation between solubility parameter and molecular properties (1994)
    Springer
    Chromatographia 38 (1994), S. 599-608 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Solubility parameters ; Structure parameters
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The application and significance of the solubility parameter are detailed for chromatographic systems. A critical review of the general concept and several empirical and semi-empirical equations for the solubility parameter are reported. Using the basic theory and a systematic study of the main factors affecting total (or expanded) solubility parameters (δT) along with boiling points and molar volumes, we found correlations between four kinds of solubility parameter obtained by different methods, which unify their calculation and establish an equation for the calculation of δT, successfully applying it to retention prediction in GC and LC. The results show our approach is more accurate and simplifies to a two-parameter model involving fundamental physicol-chemical parameters. In addition, the variation of δT with the carbon number of homologous series was investigated, mathematical models were derived by multi-regression analysis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02277161
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    Paper (German National Licenses)
    Fulltext
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