00000nam 2200000zi 4500 9.877986 CaOODSP 20241203113651 m go d f cr |n||||||||| 190814s1992 onc #otb f000 0 eng d CaOODSP eng rda CaOODSP eng fre n-cn--- En13-5/92-25E-PDF Lee, H. B., author. In situ supercritical carbon dioxide extraction and derivatization determination of phenolics from sediments of pulp mill origin / H.B. Lee, T.E. Peart and R.L. Hong-You. Burlington, Ontario : Research and Applications Branch, National Water Research Institute, [1992] 1 online resource (18 pages). text txt rdacontent computer c rdamedia online resource cr rdacarrier NWRI contribution ; 92-25 Digitized edition from print [produced by Environment and Climate Change Canada]. Includes bibliographical references (pages 14-15). "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. Includes abstract in French. gccst Sediments gccst Water pollution Peart, Thomas E., author. Hong-You, Robert L., author. Canada. Environment Canada. National Water Research Institute (Canada). Research and Applications Branch. NWRI contribution ; 92-25. (CaOODSP)9.844121 PDF 1.72 MB https://publications.gc.ca/collections/collection_2019/eccc/en13-5/En13-5-92-25-eng.pdf