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In Situ Supercritical Carbon Dioxide Extraction and Derivatization Determination of Phenolics from Sediments of Pulp Mill Origin

出版	Environment Canada, National Water Research Institute, 1992
URL	http://books.google.com.hk/books?id=ebFptAEACAAJ&hl=&source=gbs_api

註釋"A method for the determination of extractable chlorinated phenolics in sediments collected downstream of chlorine-bleaching mills was developed by using a single step in situ derivatization technique in conjunction with supercritical carbon dioxide extraction. Phenolics in air dried samples were extracted at 110°C and 37 MPa and simultaneously acetylated under static conditions by acetic anhydride in the presence of triethylamine. The derivatives were then removed from the matrix in the dynamic extraction stage. Various factors affecting the recovery of phenolics in weathered sediment samples were evaluated. While the results obtained by this SFE/derivatization method were comparable to conventional technique such as Soxhlet extraction, the SFE approach required no solvent in the extraction steps and was extremely time efficient (ca.35 min)"--Abstract.