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Author Grimaldi, F. S.
Sponsorship USDOE
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword CHEMISTRY ♦ CYANIDES ♦ GRANITES ♦ IRON ♦ LEACHING ♦ MAGNESIUM ♦ MELTING ♦ MOLYBDENUM ♦ NIOBIUM ♦ ORGANIC SULFUR COMPOUNDS ♦ PHOTOMETRY ♦ QUANTITATIVE ANALYSIS ♦ RHENIUM ♦ ROCKS ♦ SENSITIVITY ♦ SEPARATION PROCESSES ♦ SODIUM HYDROXIDES ♦ SPECTRA ♦ SPECTROSCOPY ♦ THIOCYANATES ♦ THIOCYANIDES ♦ TITANIUM ♦ TUNGSTEN ♦ VANADIUM
Abstract A modified niobium thiocyanate spectrophotometric procedure relatively insensitive to titanium interference is presented. Elements such as tungsten, molybdenum, vanadium, and rhenium, which seriously interfere in the spectrophotometric determination of niobium, are separated by simple scdium hydroxide fusion and leach; iron and magnesium are used as carriers for the niobium. Tolerance limits are given for 28 elements in the spectrophotometric method. Specific application is made to the determination of niobium in the parts per million range in rocks. The granite G-1 contains 0.0022% niobium and the diabase W-1 0.00096% niobium. (auth)
ISSN 00032700
Educational Use Research
Learning Resource Type Article
Publisher Date 1960-01-01
Publisher Department Geological Survey, Washington, D.C.
Journal Analytical Chemistry
Volume Number 32
Organization Geological Survey, Washington, D.C.


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