Download Chromatography Library. Modern Liquid Chromatography of by B.G. Belenkii, L.Z. Vilenchik PDF

By B.G. Belenkii, L.Z. Vilenchik

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This precision depends not only on the quality of the system but also on calibration data and the method used for the interpretation of chromatograms. Generally the errors in calibration data on molecular weights (and, hence, on the corresponding retention volumes) are much higher than the instrumental errors previously considered. Therefore, the latter are not of decisive importance for the chromatographic determination of molecular-weight characteristics of the polymer. They are closely related only to the correction of chromatograms for instrumental spreading.

05). In gas chromatography the maximum value of h is attained at lower values of v. 8). 6. 1 1 10 I 100 I 1,000 I 10,000 Reynolds n u m b e r , Re Fig. 8. Reduced HETP, h , vs. Reynolds' number, Re. Fig. 9. Tortuoaity coefficient (obstruction factor) vs. reduced flow rate. chromatography (including GPC) the effect of turbulence can be neglected, whereas in gas chromatography this cannot be done. To complete the consideration of factors affecting the spreading of the chromatographic zone, the results obtained by Hawkes [37] should be mentioned.

It is possible to find the efficiency required for visual separation (for a low-molecularweight substance with Kd = 1) from eqns. lo6and a given value of K R (obtained from Fig. 14). 116) where cu"= 1 - Vo/V,, Mlim and Mo are the limits of linear calibration and M1 and M 2 the molecular weights of the polymers that should be visually separated (h,/h is the ratio of reduced HETP for a high polymer to that for a low-molecular-weight substance at the same elution rate v). For example, for the visual separation of samples with molecular weights MI = lo4 and M2 = 10' on a column with a linear calibration in the range [ lo2; 10'1 the required efficiency is N = 1400 at h,/h = 7.

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