Abstract
A simple and robust flow injection extraction system has been developed. The system exploits the wetting film of the organic phase which forms on the walls of the hydrophobic Teflon tubing. This wetting film is stationary and thus reduces the average linear velocity of the organic flow. Any component extracted into the organic phase requires more time to pass through the extraction coil than the unextracted components. Using organic solvents such as hexanol, which have a high viscosity and low interfacial tension, the differential flow velocities can yield a separation in time between unextracted and extracted components
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