Novel Approach to Sample Preconcentration by Solvent Evaporation in Flow Analysis

Radial sample preconcentration.

In this paper we present a radial sample preconcentration strategy enabled by axisymmetric concentration polarization in a microfluidic chamber on a uniform nanoporous film. Sample analytes are focused into the centre, creating a concentrated plug that is injected vertically into the microfluidic analysis layer. No balancing pressure driven flows or tangential fields are required, and the proce...

Role of Sample Decomposition and Preconcentration in Elemental Trace Analysis

Progress in elemental trace analysis means that lower con— centrations can be determined in a more reliable and efficient way. The demands posed to trace element analysis follow generally the tendency that lower and lower concentrations should be determined in matrices which become more and more complex. The most economical scientific strategy depends strongly on the element to be determined, o...

On-line sample preconcentration by large-volume sample stacking with an electroosmotic flow pump (LVSEP) in microscale electrophoresis.

This review highlights on-line sample preconcentration by large-volume sample stacking with an electroosmotic flow pump (LVSEP) in microscale electrophoresis. LVSEP requires only a hydrodynamic sample injection into the whole capillary/microchannel and a constant voltage application, i.e., without polarity switching, providing an efficient sensitivity enhancement with a relatively easy experime...

Porous Fiber Formation in Polymer-Solvent System Undergoing Solvent Evaporation

Preconcentration of Zn(II) in Water Sample Using Modified NanoFiber

A new simple and reliable method for rapid and selective extraction and determination of trace levels of Zn(II) ion is developed. Zn(II) ions are adsorbed quantitatively during passage of aqueous samples through PET-AA/AAm nano fiber modified. Almost all matrix elements were found to pass through the nano fiber to drain. Modified Poly (ethylene terephthalate)-grafted-Acrylic acid/Acryl amide Na...