Accurate empirical equation of ionic mobility from electrolytic conductance

doi:10.3724/SP.J.1123.2016.03003

Abstract

Abstract:

Detection of electrolytic conductivity can be accurately and simply performed. If such detection can be used for the study of ionic mobility, it may supply an accurate, simple and cheap method for the study. This work develops a novel theoretical method for such a study with electrolytic conductivity. An empirical equation for mono-valent ionic mobility is chosen as the studied target. By adequate data of conductivity of 19 mono-mono-valent electrolytes, we correct the empirical equation with near 10% maximum bias as an accurate one with 5% maximum bias with no more than 0.05 mol/L ionic strength. The predictions with the corrected equation are in good agreement with the exact mobilities of salt ions detected by moving boundary method and in high coincidence with the precise mobilities of the 32 large organic ions obtained by the Lucy's equation. Thus, the work also shows the high agreement among the conductivities and mobilities of the 19 small inorganic and the 32 large organic ions. A more accurate equation with 2% maximum deviation is given under the ionic strength of 0.02 mol/L. The advanced approach holds the special advantages. Firstly, adequate electrolytic conductivities in references can be used for the study of ionic mobility. Secondly, it makes the further study very easy due to the simple detection of the electrolyte conductivity.

Key words: capillary electrophoresis (CE), electrolytic conductance, empirical equation, ionic mobility, ionic strength

CLC Number:

O658

HE Yuchen, WU Xuejing, KONG Fanzhi, CAO Chengxi, FAN Liuyin, XIAO Hua. Accurate empirical equation of ionic mobility from electrolytic conductance[J]. Chinese Journal of Chromatography, 2016, 34(6): 625-634.

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