00000nam 2200000zi 4500 9.873249 CaOODSP 20241203113648 m o d f cr ||||||||||| 190517s1989 onca #ob f000 0 eng d CaOODSP eng rda CaOODSP eng fre e-sz--- En13-5/89-05E-PDF Leppard, Gary G., author. Colloidal iron oxyhydroxy-phosphate : the sizing and morphology of an amorphous species in relation to partitioning phenomena / Gary G. Leppard, R.R. De Vitre, D. Perret and J. Buffle. Burlington, Ontario, Canada : National Water Research Institute, Lakes Research Branch, Canada Centre for Inland Waters, [1989] 1 online resource (15 pages, 1 unnumbered page) : illustrations. text txt rdacontent computer c rdamedia online resource cr rdacarrier NWRI contribution ; 89-05 Title from cover. Digitized edition from print [produced by Environment and Climate Change Canada]. Includes bibliographical references. "An iron-rich fraction was isolated from a small eutrophic lake and studied on a particle-specific basis by (1) conventional transmission electron microscopy (TEM) and (2) scanning transmission electron microscopy in conjunction with energy-dispersive spectroscopy (STEM/EDS). Additionally, the fraction per se was characterized by classical wet chemistry. A morphologically distinctive particulate was discovered to be rich in Fe (in an X-ray amorphous form) and P (as phosphate), and it also contained some Ca. Particle sizes determined by TEM fell entirely into the colloidal range, with a great majority of those trapped by a cutoff filter of 0.45 um showing a mean diameter below 0.13 um. Several morphotypes could be identified at 3 nm resolution in ultrathin sections of plastic-embedded colloid fractions. New technology transferred from the biomedical sciences was used to obtain ca. 1 nm resolution, and revealed (1) irregular arrays of subunits with a least diameter approaching the resolution limit and (2) many varieties of the principal morphotypes. A range of 130 nm down towards the molecular range was found to be more representative of the true particle size distribution than one derived solely from filtration data based on filter pore sizes. Size distributions established by cascade filtration assessments are shown to be related to colloid aggregation phenomena which may affect phosphate partitioning between the operationally-defined solid and soluble phases"--Abstract. Includes abstract in English and French. gccst Water pollution gccst Metals gccst Measurement De Vitre, Richard R., author. Perret, Didier, 1959- author. Buffle, J. (Jacques), 1943- author. Canada. Environment Canada. National Water Research Institute (Canada). Lakes Research Branch. Canada Centre for Inland Waters. NWRI contribution ; 89-05. (CaOODSP)9.844121 PDF 1.33 MB https://publications.gc.ca/collections/collection_2019/eccc/en13-5/En13-5-89-05-eng.pdf