Abstract
In this work, a pseudostationary phase of organic solvent replaces the microcolumn in flow injection preconcentration. This pseudostationary phase results from the wetting of hydrophobic tubing by the organic solvent within the concurrent flow of two immiscible phases through narrow tubing. If this wetting film is sufficient thick, a differential velocity between the aqueous and organic phases develops within the two-phase segmented flow. The effect of experimental parameters such as sample volume, flow rate, phase ratio, and tubing diameter on the preconcentration factor are characterized. Using these procedures, preconcentration factors in excess of 50-fold are obtained with a throughput of 30 samples/h.
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