Download Advances in Chromatography: Volume 41 by Phyllis R. Brown, Eli Grushka PDF

By Phyllis R. Brown, Eli Grushka

An up to date reference, supplying an leading edge viewpoint on breakthroughs in separation technological know-how, reminiscent of reverse-phase HPLC, advances in hyphenation, and linear dependence of relative retention values at the nature of the service gasoline and standard column strain in gas-liquid chromatography.

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Extra resources for Advances in Chromatography: Volume 41

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The cou- Fundamentals of Capillary Electrochromatography / 33 pling of CEC with mass spectrometry has been successfully realized by several workers, mainly by employing electrospray ionization [34,38,95,98,116,121–127]. Also, the on-line coupling of CEC with nuclear magnetic resonance spectroscopy has been recently reported [128–130]. Guo et al. [131] coupled pressurized CEC with a condensation nucleation light-scattering detector using an electrospray interface. They demonstrated that condensation nucleation light-scattering detection is a sensitive and universal detection method for CEC.

Consequently, in the detection volume along the optical path of the detector there is (nonspecific) intensity loss of the incident beam due to diffuse scattering, and also if the stationary phase does not absorb at the detection wavelength. The extent of intensity loss is dependent on the difference in diffraction index between the two phases. In the ideal case (match of diffraction indices of stationary and mobile phase) the detection window is transparent, becoming opaque or even nontransparent in the case of extreme differences in the diffraction index.

In CEC the sample is in most cases injected directly onto the column via the controlled application of a voltage (electrokinetic injection), and the velocity of the mobile phase is given not as flow rate (volume/time) but as linear velocity (distance/time) determined via a nonretarded marker. Assuming that the contribution due to detection and data processing can be neglected, the tolerable injection plug length for a column of given length and efficiency can be easily calculated [51]. The partial second moment (variance, σ2I for the injection plug (rectangular distribution) can be determined from the injection plug length L I [50].

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