Journal
JOURNAL OF CHROMATOGRAPHY A
Volume 909, Issue 1, Pages 79-85Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S0021-9673(00)01014-1
Keywords
solid-phase extraction; membranes; instrumentation; benzenes
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The properties and advantages of membrane disks for solid-phase extraction (SPE) are described. Miniaturization is a trend in SPE, as well as chemical analysis in general. A semimicro method is reviewed in which an extraction disk 4 mm in diameter is used for SPE. Even smaller scale separations are possible with a device in which a membrane 0.7 mm in diameter was incorporated into the needle of a 50-mul syringe. Aqueous samples containing 10 ppb of eight substituted benzenes were passed through the miniaturized-SPE syringe automatically using a single-syringe infusion pump. Elution volumes of 5 mul provided 500-fold concentrations and delivered average recoveries greater than 90% and an average relative standard deviation (RSD) of 4.6% for the analytes. Direct injection of the 5 mul eluate from the miniaturized-SPE syringe into a gas chromatograph also produced average recoveries greater than 90% and an average RSD of 6.2%. (C) 2001 Elsevier Science B.V: All rights reserved.
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