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Page 6166, results 154126 - 154150

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A dithizone method for the determination of lead in monazite
R. A. Powell, C. A. Kinser
1956, Trace Elements Investigations 630
In determining lead in monazite [(Ce,La,Th)PO4]--to be used as the basis for geologic age measurements--it was necessary to eliminate interferences due to the presences of phosphates of thorium and the rare-earth metals. The method, in which monazite samples are attacked with hot concentrated sulfuric acid, taken up with dilute nitric acid,...
Occurrence of selenium in sulfides from some sedimentary rocks of the western United States
Robert G. Coleman, Maryse Delevaux
1956, Trace Elements Investigations 632
Investigations of the minor- and trace-element content of sulfides associated with uranium ore deposits from sandstone-type deposits have shown that selenium commonly substitutes for sulfur. The Morrison formation and Entrada sandstone of Jurassic age and the Wind River formation of Eocene age seem to be seleniferous stratigraphic zones; sulfides deposited...
Detailed mineral and chemical relations in two uranium-vanadium ores
Robert M. Garrels, E. S. Larsen III, A. M. Pommer, R. G. Coleman
1956, Trace Elements Investigations 635
Channel samples from two mines on the Colorado Plateau have been studied in detail both mineralogically and chemically. A channel sample from the Mineral Joe No. 1 mine, Montrose County, Colo., extends from unmineralized rock on one side, through a zone of variable mineralization, into only weakly mineralized rock. The unmineralized...
The determination of uranium (IV) in apatite
Roy S. Clarke Jr., Zalman S. Altschuler
1956, Trace Elements Investigations 637
Geologic and mineralogic evidence indicate that the uranium present in apatite may proxy for calcium in the mineral structure as U(IV). An experimental investigation was conducted and chemical evidence was obtained that establishes the presence of U(IV) in apatite. The following analytical procedure was developed for the determination of U(IV). Carbonate-fluorapatite...
Uranium content and leachability of some igneous rocks and their geochemical significance
George J. Neuerburg, John C. Antweiler, Barrie H. Bieler
1956, Trace Elements Investigations 626
The uranium content and its leachability in 442 igneous rocks if wide variety were measured. Four-gram samples, crushed below 38 mesh, were leached in in 0.05 M HNO3 for half an hour at 80 to 85° C; the leachate and undissolved residue were analyzed fluorimetrically. This study explored the relation of...
Uranium distribution in pseudowollastonite slag from a phosphorus furnace
Edward Young, Zalman S. Altschuler
1956, Trace Elements Investigations 615
Silicate slag from the Victor Chemical Company phosphorus furnace at Tarpon Springs, Fla., has been found to consist essentially of pseudowollastonite, α-CaSiO3. The first-formed crystals are euhedral laths which form a mesh making up most of the slag. As the slag continues to solidify, its composition changes slightly and more...