A continuous preconcentration/extraction method for organic trace analysis by capillary gas chromatography |
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Authors: | Curvers J Noij T Cramers C Rijks J |
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Institution: | (1) Department of Chemistry, Laboratory of Instrumental Analysis, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands |
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Abstract: | Summary A slightly modified steam distillation-extraction device is described for the continuous extraction and preconcentration of
organic traces in aqueous samples, prior to capillary G.C.-analysis.
The quantitative performance, both theoretically and practically, is studied using phenols as the test substances. The final
recovery is determined by the flow-ratio of the water and the extracting solvent and by the extraction coefficient.
The process is found to be highly reproducible even at low concentration levels (ppb’s). Using 30 ml. samples with a concentration
of 30 ppb (1:10^9), 100 % recoveries are obtained for the phenolic substances studied, with a relative standard deviation
of about 3 %, both for methylene chloride and ethylacetate as the extracting solvents. Using methylene chloride as the extracting
solvent, for phenol a maximum recovery of 80 % was obtained.
Presented at the 15th International Symposium on Chromatography, Nürnberg, October 1984 |
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Keywords: | Continuous extraction Trace analysis Capillary Gas chromatography Steam distillation-extraction |
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