Simultaneous Extraction and Derivatization of Acidic Polluents Adsorbed onto Anion Exchange Resins from Water Using Supercritical Carbon Dioxide Containing Derivatization agent

• Main Authors: Yu, Jeng, 于正
• Other Authors: Gour-Rong Her
• Format: Others
• Language: zh-TW
• Published: 1997
• Online Access: http://ndltd.ncl.edu.tw/handle/75147969543813777408

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.