Record Display for the EPA National Library Catalog


Main Title X-Ray Diffraction and Electron Beam Analysis of Asbestiform Minerals in Lake Superior Waters.
Author Cook, Philip M. ; Rubin, Ivan B. ; Maggiore, Carl J. ; Nicholson., William J. ;
CORP Author Environmental Research Lab.-Duluth, Minn. ;Mount Sinai School of Medicine, New York. Environmental Sciences Lab.
Year Published 1976
Report Number EPA/600/J-76/014;
Stock Number PB-265 285
Additional Subjects Asbestos ; Water pollution ; Lake Superior ; Mining ; Iron ores ; Taconite ; Tailings ; Quantitative analysis ; Water analysis ; Fibers ; Amphiboles ; X ray diffraction ; Electron microscopy ; Silver Bay ; Minnesota ; Reprints ; Transmission electron microscopy
Library Call Number Additional Info Location Last
NTIS  PB-265 285 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 11p
Western Lake Superior water, which is used for municipal water supplies, contains large concentrations of asbestiform amphibole fibers because of a taconite tailings discharge at Silver Bay, Minnesota. Large fluctuations in fiber concentrations are attributable to seasonal and meteorological changes which influence Western Lake Superior water circulation. Variations in electron microscope amphibole fiber counts generally correspond to variations in amphibole mass concentration determined by x-ray diffraction. Daily x-ray diffraction and occasional transmission electron microscope measurements of Duluth, Minnesota drinking water samples allows an estimate of the average (45-100 million) and the range (10-1000 million) of identifiable amphibole fibers per liter of water. Not all the amphibole fibers present can be identified due to their extremely small width. Copyright (c) 1976 by The Institute of Electrical and Electronics Engineers, Inc.