Simultaneous Extraction and Derivatization of Acidic Polluents Adsorbed onto Anion Exchange Resins from Water Using Supercritical Carbon Dioxide Containing Derivatization agent
碩士 === 國立臺灣大學 === 化學系研究所 === 85 === In-situ chemical derivatization under supercritical carbon dioxide is an effective mean to increase the extraction efficiency for polar and ionic species. In addition , it conditions analytes for their subsequent...
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| Other Authors: | |
| Format: | Others |
| Language: | zh-TW |
| Published: |
1997
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| Online Access: | http://ndltd.ncl.edu.tw/handle/75147969543813777408 |
| Summary: | 碩士 === 國立臺灣大學 === 化學系研究所 === 85 === In-situ chemical derivatization under supercritical carbon dioxide is an
effective mean to increase the extraction efficiency for polar and ionic
species. In addition , it conditions analytes for their subsequent
chromatographic sepeation. In-situ chemical derivatization and
extraction of acidic polluents including haloacetic acids, phenols and
phenoxyacetic acids adsorbed onto a anion exchange resins was achieved by
using either methyl iodide or pentafluorobenzyl bromide as derivatization
agents. Phenols and phenoxyacetic acids were concentrated on 0.5 ml anion
exchange resin and derivatized and extracted using pentafluorobenzyl bromide
in supercritical carbon dioxide whereas haloacetic acids adsorbed on the
resin were derivatized and extracted with methyl iodide in supercritical
carbon dioxide. The derivatives were collected into organic solvent and
analysed by capillary gas chromatography/mass spectrometry. 100ml 3 ppb of
Phenols and phenoxyacetic acids can be detected by this method.
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