title: Bidirectional isotachophoresis on a planar chip with integrated conductivity detection.
abstract: The use of a miniaturised planar separation device with integrated conductivity detection for performing bidirectional isotachophoresis (ITP) is described. The chips were produced in poly(methyl methacrylate) (PMMA) using a milling procedure. To enable bidirectional ITP the devices were designed to inject samples into the centre of the section channel and incorporated two integrated on-column conductivity detectors, positioned at opposite ends of this channel. When used with a hydrodynamic sample transport system the devices were used for the analysis of a range of small ions: NH4+; Na+; Mg2+; Ca2+; Li+; NO3-; ClO4-; SO4(2-); F-. Results sucessfully achieved included the simultaneous separation of three anions and three cations.
authors.affiliation: Department of Instrumentation and Analytical Science, UMIST, Manchester, UK. j.prest@umist.ac.uk
authors.forename: Jeff E
authors.initials: JE
authors.lastname: Prest
authors.forename: Sara J
authors.initials: SJ
authors.lastname: Baldock
authors.forename: Peter R
authors.initials: PR
authors.lastname: Fielden
authors.forename: Nicholas J
authors.initials: NJ
authors.lastname: Goddard
authors.forename: Bernard J
authors.initials: BJ
authors.lastname: Treves Brown