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艦旗

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CRASS

Erratum to: Media in the Middle East, size and composition of copolymers. The present pages are intended to give an overview on CCF methods which are susceptible of automation. Hence, these pages concentrate on CCF by combination of SEC and gradient HPLC, preferably in a sequence as illustrated in Fig. 10.1. (The opposite sequence has

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AIL

Chemical Heterogeneity of Copolymers,ution curve. Information on the complex MW/CCD can be provided as shown in Fig. 2.1a and b by plotting . vs M. In Fig. 2.1a is, for a ., the average molecular weight due to all B units in a macromolecule, .., plotted vs the corresponding average .. of all A units. This mode of plotting [1] is especi

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STANT

Solubility and Adsorption Effects in Polymer HPLC,atographic retention in a given case” [1]. This chapter deals with the methods of finding out whether or not one of the mechanisms in question predominates. Information on the mechanismus of a given polymer separation can be derived (i) from the dependence of retention time on sample size, (ii) by c

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Effect of Mobile and Stationary Phase in Polymer HPLC,ause dramatic changes in elution behaviour, see Sect. 4.3. For example, a polystyrene standard (M = 50,000) was eluted without retention from a 30nm RP C18 column by water + THF (13:87 v/v) whereas, with a 17:83 v/v mixture, no elution was observed within reasonable time [1], see Fig. 6.1.

JIBE

Detection in Gradient High-Performance Liquid Chromatography,es alter in the course of the analysis. Even solvent combinations purposefully selected with respect to a certain property, e.g. “iso-refractive” solvents, cannot ensure proper measurements of small solute concentrations by detectors which monitore a bulk property of the mobile phase plus the solute

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Quantitative Evaluation and Calibration,d not only make quantitative evaluation illusive but also may severely falsify even qualitative conclusions. Since these effects disturb the common linear dependence of peak area on sample size, quantification of suitable calibrating chromatograms is strongly recommended.