Precise measurement of mobility from the length of isotachophoretic zones

A new method for the precise estimation of the ionic mobilities was describ ed. The procedure issues from the measurement of the time of moving boundar y between leading and terminating electrolyte in the geometrically and ther mometrically well-defined device for capillary isotachophoresis. An indirec t method for the determination of mobilities of low movable ionic species w as also derived. The ionic mobilities of some anionic pesticides and cation ic drugs were measured. The procedure can be used for estimation of transfe rence numbers and also their temperature coefficient. (C) 1999 Elsevier Sci ence B.V. All rights reserved.