Gas/Liquid and Liquid/Liquid Solvent Extraction in Flow Analysis with the Chromatomembrane Cell

Abstract

Abstract:Since twelve years the Chromatomembrane Cell has been proposed as a new and versatile device for extraxtion procedures in the flow based analysis. In the meantime a remarkable number of papers was submitted dealing with applications of the novel method to all the conceivable varieties of flow injection and sequential injection analysis. The device supports important analytical procedures such as sampling, sample preparation, and preconcentration each being combined with a phase transfer of the analyte. The Chromatomembrane Cell can be coupled to most of the modern detectors which work computer aided in the laboratories of today. Centrepiece of the cell is a block made from biporous hydrophobic PTFE, inside which polar (in the macropores) and nonpolar (in the micropores) solvents come into a close contact with each other and might flow independently with different flow rates. Microporous PTFE membranes prevent polar phases from their flowthrough into directions which are reserved for nonpolar fluids only. Thus, a strict control over the fluxes can be established at the analysts request. Especially, that PTFE block offers outstanding possibilities as a sampling unit for air monitoring.

Chromatomembrane preconcentration of phenols using a new 3D printed microflow cell followed by reversed‐phase HPLC determination

“…In chromatomembrane methods, a chromatographic mechanism of the interphase exchange is combined with a membrane routine of incoming and outcoming phases concerning the zone of mass exchange. Such-like a combination of functionalities ensures, on the one hand, the high efficacy of separation inherent to chromatographic methodologies, and on the flip-side -a plausibility of separation in either a continuous or an easily automated discretely sampled regime [2]. The regularities of chromatomembrane methods, peculiarities of set-ups for their implementation, routes for processing biporous matrices, employed in the mass-exchange chromatomembrane processes, alongside the examples of the practical application of the methods are provided in a recent work [3].…”

Advancement of Flow-based Analysis with Alternative Chemical Reactions and New Devices for Environmental and Biological Samples

“…This separator could be used for about 1 week without exchange of the membrane in the berberine-perchlorate ion pair extraction system. 22 Chromatomembrane cells have been proposed for sample preconcentration by a liquid-liquid extraction procedure by Moskvin et al [24][25][26] Figures 5 and 6 show a schematic flow diagram of an automated preconcentration and extraction system by means of a 16-port valve for anionic surfactant determination. The novel extraction device consists of a rectangular block of biporous PTFE.…”