00000nam 2200000zi 4500 9.877207 CaOODSP 20241203113650 m o d f cr bn||||||||| 190730s1994 onca ob f000 0 eng d CaOODSP eng rda CaOODSP n-cn-on En13-5/94-31E-PDF Fox, M. E., author. Potentially significant underestimation of PAHs in contaminated sediments / by M. Fox, T. Murphy, L. Thiessen, R. Khan. [Ottawa] : Environment Canada, Water Science and Technology Directorate = Environnement Canada, Direction générale des sciences et de la technologie, eau, [1994] 1 online resource (6 unnumbered pages) : illustrations. text txt rdacontent computer c rdamedia online resource cr rdacarrier [NWRI contribution] ; 94-31 Cover title. Digitized edition from print [produced by Environment and Climate Change Canada]. Includes bibliographical references. "Freshwater and marine sediment samples collected for analysis of trace organic contaminants are frequently freeze dried and then stored, either cold or at ambient temperatures, sometimes for years, before extraction and analysis. The potential for loss of up to 99% of naphthalene was observed during the analysis of coal tar contaminated sediments from Hamilton Harbour, Lake Ontario. Investigations revealed that inadequate temperature control and excessive total exposure time during freeze drying produced large and highly variable losses of naphthalene and much smaller losses of higher molecular weight PAHs. Such under reporting of naphthalene may lead to serious underestimation of the acute toxicity of sediments to benthic fauna"--Abstract. gccst Lakes gccst Sediments gccst Pollutants Murphy, Thomas P. D. (Thomas Patrick Daniel), 1948- author. Thiessen, Lina A., author. Khan, Raza M., author. Canada. Environment Canada. Canada. Water Science and Technology Directorate. National Water Research Institute (Canada). Lakes Research Branch. NWRI contribution ; 94-31. (CaOODSP)9.844121 PDF 941 KB https://publications.gc.ca/collections/collection_2019/eccc/en13-5/En13-5-94-31-eng.pdf