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Discusses techniques in sample preparation that are based on liquid membrane extraction. Degree of selectivity and enrichment capability offered by the techniques; Use of small amounts of organic solvents; Possibilities for direct and automated interfacing with chromatography systems and other instruments of analysis; Scope of membrane extraction; Supported liquid membrane principles.

Discusses the suggestion made by the American, European and Japanese pharmacopoeias on hot to calculate the asymmetry of chromatographic peaks. Interpretation of the quotient as the observed width of the peak divided by what would have been determined if no asymmetry occurred; Assessment of the validity of the calculation.