An evaluation and comparison of micro-techniques for concentration of volatile components from dilute solutions |
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Authors: | S Blomberg J Roeraade |
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Institution: | (1) Department of Analytical Chemistry, Royal Institute of Technology, S-100 44 Stockholm, Sweden |
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Abstract: | Summary Several micro-techniques for the removal of solvent from dilute solutions of volatile compounds have been compared. Large
solute losses were experienced when the conventional blow-down technique was applied. Better yields could be obtained with
static evaporation procedures, as long as an effective reflux was maintained. However, careful optimization of the vessel
design and operating conditions is necessary. The most efficient volume reduction technique was shown to be chromatographic
evaporation. Quantitative recoveries were obtained for the compounds tested and the process was significantly faster than
static concentration. Moreover, operating conditions (gas flow, temperature) are less critical. With modifications, the principle
can be used for the concentration of large sample volumes down to a few microliters. |
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Keywords: | Gas chromatography Sample concentration Chromatographic evaporation Solvent effect |
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