00000nam 2200000za 4500 9.848427 CaOODSP 20241203113640 cr ||||||||||| 171207s1985 onca|||fo f000 0 eng d CaOODSP eng eng eng fre n-cn--- En13-5/85-81E-PDF Ultra-clean techniques in assessing metal effect on phytoplankton [electronic resource] / P.T.S. Wong ... [et al.]. Burlington, Ont. : Environmental Contaminants Division, National Water Research Institute, Canadian Centre for Inland Waters : Great Lakes Fisheries Research Branch, Department of Fisheries and Oceans, [1985]. 7, [8] p. : ill. NWRI contribution ; 85-81 "This manuscript has been submitted for Proceedings, 12th Ann. Aquatic Toxicology Workshop and the contents are subject to change". "Division Control No. ECD-112B". Digitized edition from print [produced by Environment and Climate Change Canada]. Includes bibliographical references: p. 7 "The necessity of using ultra-clean techniques (metal-free) in measuring primary productivity in waters from Batchewana Bay, Lake Superior and Turkey Lake, Ontario was evaluated. There was no significant difference in productivity in waters collected with a Van Dorn bottle (which has metal components) and with a metal free rubber-and-plastic hand pump. Incubation of waters in polycarbonate flasks gave much higher productivity than in glass flasks, but the decrease in values in glass flasks was not due to the leaching of metals from the glass flasks since there was no significant difference in the quantity of Cu, Pb, Ni and Zn leached from the two types of flasks. However, contamination of waters by the addition of a mixture of metals (Cu (5 ug/L), Zn (30 ug/L), Ni (25 ug/L), and Pb (25 ug/L)) resulted in a drastic decrease in productivity"--Abstract. Includes executive summary in English and French. gccst Water quality Wong, P. T.- S., 1939- . Canada. Environment Canada. National Water Research Institute (Canada) NWRI contribution ; no. 85-81 (CaOODSP)9.844121 PDF 1.08 MB https://publications.gc.ca/collections/collection_2017/eccc/En13-5-85-81-eng.pdf