| Autor: |
E. G. Vand Der Velde, C. P. Swart, M. Dietvorst, M. R. Ramlal, P. R. Kootstra |
| Rok vydání: |
1994 |
| Předmět: |
|
| Zdroj: |
Journal of Chromatography A. 683:167-174 |
| ISSN: |
0021-9673 |
| Popis: |
The optimization of supercritical fluid extraction (SFE) of organochlorine pesticides from real soil samples is performed, according to a general stepwise set-up for quantitative SFE. Optimal conditions obtained from experiments with spiked samples were applied on real soil and the influence of several extraction parameters was tested to gain maximum concentrations of components in comparison with solvent extraction. The optimal conditions achieved for spiked samples did not yield maximum concentrations for field samples. Stronger extraction conditions were necessary to overcome interactions between matrix and analytes. Longer dynamic extraction times were needed and the use of modifiers appeared to be essential for SFE of real samples. An increase in extraction pressure did not have any influence on extraction results. Comparable results were obtained for SFE and solvent extraction with an overall standard deviation between both methods of 25%. The stepwise approach is useful in method development to visualize several aspects of SFE, such as the initial conditions, the importance of extraction parameters and the success of SFE for a specific compound—matrix combination. Possibilities in quantitative SFE are discussed, as well as restrictions in the break-through of SFE as technique for future sample pretreatment of solid samples. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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