00000nam 2200000za 4500 9.849687 CaOODSP 20241203113641 cr ||||||||||| 180108s1986 onca|||fob f000 0 eng d CaOODSP eng eng fre n-cn-on En13-5/86-136E-PDF Leppard, Gary G. Organic and iron-rich colloids in three major rivers of Ontario's arctic watershed [electronic resource] / by Gary G. Leppard, Robert C. McCrea, Dina Urciuoli. Burlington, Ont. : Hydraulics Division, National Water Research Institute, 1986. 25 p. : ill. NWRI contribution ; 86-136 "Control No. AED44". Digitized edition from print [produced by Environment and Climate Change Canada]. Includes bibliographical references. "The colloidal fraction of river waters is usually ignored in considerations of metal dispersion; and colloidal organic carbon as a metal-dispersing agent tends to be considered in theoretical terms only. This report shows that, for three northern Ontario rivers, a colloidal fraction accounts for 40% of the iron normally attributed to the dissolved phase. Much of this iron is associated with a small fraction of organic colloids; and particularly with spheroids whose diameter is in the range of 0.015-0.060 um. Such spheroids go undetected by many techniques used by limnologists. The descriptions of the riverine colloidal fractions provided here are probably the first high resolution (0.003 um resolution) studies availbble on the structure, size, shape and relative iron levels of dominant riverine colloids"--Management perspective. Includes a title, abstract and management perspective in French. gccst Water quality gccst Water pollution Urciuoli, Dina. McCrea, R. C. Canada. Environment Canada. National Water Research Institute (Canada) NWRI contribution ; no. 86-136 (CaOODSP)9.844121 PDF 2.20 MB https://publications.gc.ca/collections/collection_2018/eccc/En13-5-86-136-eng.pdf