Differential electrical mobility analysis

Commercial instruments are available for a variety of applications in aerosol instrumentation, production of materials from aerosols, contamination control, etc. (ISO/CD 15900 2006, Determination of Particles Size Distribution—Differential Electrical Mobility Analysis for Aerosol Particles). 

In addition to these techniques, applications of capillary electrophoresis for lantharride analysis have appeared recently (Corr and Arracleto 1996, Vogt and Comadi 1994). Capillary electrophoretic separations rely on differences in the electrophoretic mobility of analyte species in an electrolyte buffer while tmder the influence of an applied electric field. For lanthanide analysis, the mobilities of the solvated cations are not adequately differentiated for an effective mutual separation, though separation from trarrsition metals or alkali/alkaline-earth metals should be readily accomplished. Introduction of chelating agents that form complexes with the ions leads to improved separation efficiency through... 

Capillary electrophoresis has also been applied for lanthanide analysis. In this technique, the electro-mobility of ions in an electrolyte buffer under the influence of an applied electric field determines relative separation of the ions. Complexing anions are required for electrophoretic separation of lanthanide ions, as the differences in mobihty of the trivalent aquo ions are insufficient for differentiation of individual members of the series. Vogt and Conradi (1994) summarize the mobility of an ion in an electric field in terms of the relative concentrations of complexed ions in solution ... 

It is necessary to emphasize, that the values of parameters of rotational diffusion, obtained by methods of relaxation of electric polarization and NMR of wide lines, are integral characteristics (averaged to the total of all molecules in both phases). That is why the law patterns, discovered by this method, don t differentiate variation character of mobility of individual moleeules in different phases. NMR impulse method provides other opportunities for the information analysis. 

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