Determination of common impurities in niobium metal by the fusion—d.c. arc technique

Brooks, LeRoy S.

doi:10.1016/0371-1951(65)80178-3

Cited by 6 publications

(5 citation statements)

References 2 publications

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“…23. 13 determination, or the measurement was performed after the activity of the interfering nuclide had decreased by decay to a negligible level. Similar considerations and procedures were applied to X-ray interferences in the determination of Hf, Ta, and W.…”

Section: Resultsmentioning

confidence: 99%

Instrumental multielement proton activation analysis of high-purity niobium using both .gamma.-ray and x-ray spectrometry

Kriváň¹

1975

Anal. Chem.

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Trace concentrations of nine metallic impurities have been determined simultaneously in high purity niobium by a nondestructive technique based on irradiation of the sample with 12-MeV protons and observation of both theand Xrays from the reaction products with a Ge(Li) and a germanium low energy detector, respectively. The activation of the trace elements is based on (p,n) reactions. The elements determined are: Ti, V, Cr, Fe, Zr, Mo, Hf, Ta, and W. Three other elements, i.e., Pd, Sn and Sb, could have been determined with high sensitivities if at all present. For Ti, V, Fe, Zr, and Mo, this method is more sensitive than other techniques which have been applied to the determination of these elements in niobium excluding solid mass spectrography. Detailed data on possible interferences, precision, and limits of detection are given.Niobium has several special properties enabling its extensive application in various scientific and industrial fields. In the center of interest is the superconductivity exhibited by niobium and its compounds (1). Among the transition elements, the maximum transition temperature occurs for niobium (9.5 °K). Niobium compounds and/or solid solutions, e.g., Nb3Ge, Nb3(Ge,Al), Nb3Sn, Nb-Zr, and Nb-Ti, have become technologically the most important superconducting materials. The highest known superconducting transition temperature, Tc = 22.3 °K for Nb3Ge, was announced recently (2).Because of its suitable nuclear properties, niobium metal finds application as an end-plug in fuel elements for nuclear reactors (3). Niobium is widely used to impart special properties to alloys with regard to their corrosion and fracture resistance, hardness, fabricability, ductility, etc. Many

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Section: Resultsmentioning

confidence: 99%

Instrumental multielement proton activation analysis of high-purity niobium using both .gamma.-ray and x-ray spectrometry

Kriváň¹

1975

Anal. Chem.

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“…(TX/2 of 95Zr = 65 days, T1/2 of 95Nb = 35 days), before use, the 96Zr tracer was purified by removal of 96Nb by extraction with 0.1 M DAM from 4 M HF. The radioactive purity of the tracers was checked by high-resolution -ray spectrometry.…”

Section: Methodsmentioning

confidence: 99%

“…Optical emission spectrography using a dc arc and involving the conversion of the metals into oxides before the analysis can detect these elements only at the 10 µg/g level (3,4). By addition of certain substances, e.g., AgCl and CdS in the determination of tungsten (5), or by separations (6), the limits of detection can be improved by about 1 order of magnitude.…”

Section: Literature Citedmentioning

confidence: 99%

“…Usually low levels of NAD+ are measured by an enzymatic cycling procedure which amplifies a small quantity of coenzyme. One previously described cycling procedure utilized alcohol dehydrogenase and malic dehydrogenase (7) and has been applied to immunoassay techniques (2)(3)(4). However, as pointed out by O'Sullivan (8), these methods are of poor practical interest due to interference from biological samples which affect the enzymatic cycling step and the final fluorimetric measurement.…”

Section: Analysis Of Samples and Comparison With Othermentioning

confidence: 99%

“…a OES without matrix separation(3,4).b XRFS after extraction of matrix with MIBK and coprecipitation of Zr with Co(OH)3 (12). c Instrumental proton AA (14).…”

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confidence: 99%

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Determination of zirconium, molybdenum, hafnium, and tungsten in niobium and tantalum by x-ray fluorescence spectrometry after separation from matrix and preconcentration

Knote¹,

Kriváň²

1982

Anal. Chem.

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Dissolution of niobium and tantalum matrix and their separation from trace elements by means of extraction with diantipyrylmethanes

Caletka

Kriváň

1982

Z. Anal. Chem.

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Determination of common impurities in niobium metal by the fusion—d.c. arc technique

Cited by 6 publications

References 2 publications

Instrumental multielement proton activation analysis of high-purity niobium using both .gamma.-ray and x-ray spectrometry

Instrumental multielement proton activation analysis of high-purity niobium using both .gamma.-ray and x-ray spectrometry

Determination of zirconium, molybdenum, hafnium, and tungsten in niobium and tantalum by x-ray fluorescence spectrometry after separation from matrix and preconcentration

Dissolution of niobium and tantalum matrix and their separation from trace elements by means of extraction with diantipyrylmethanes

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