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

Knote, H.; Kriváň, V.

doi:10.1021/ac00248a046

Cited by 16 publications

(1 citation statement)

References 28 publications

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“…analysis of molybdenum can be achieved only by an effective separation of the molybdenum and technetium matrix radionuclides from the indicator radionuclides. The experience we have gathered with anion-exchange behavior of elements from HF-based media under static and dynamic conditions and its utilization for analysis and/or determination of refractory metals (35)(36)(37)(38)(39)(40)(41)(42)(43)(44) suggests that this separation system could be an adequate approach also for the solution of this analytical task.…”

Section: Introductionmentioning

confidence: 99%

Determination of uranium, thorium, and 18 other elements in high-purity molybdenum by radiochemical neutron activation analysis

Theimer¹,

Kriváň²

1990

Anal. Chem.

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A radlochemkai neutron acthratlon analysis technlque for the determination of uranium and thorium In high-purity molybdenum via the lndlcator radionuclides 290Np for U and 23sPa for Th has been developed. S k n u l t a w , the ebments Ag, Co, Cr, Cs, Cu, Fe, Ga, In, Ir, K, Mn, Na, NI, Rb, Ru, Sc, Se, and Zn can be determined, too. The elements Hf, Sb, Ta, Sn, and W were determined by instrumental neutron activation analysis. The radloclremical separatlon Is pertormed by anion exchange on a Dowex 1 X 8 column from a 20 M HF/3% H,02 medlum. A h i t of detection of 4 ng/g for uranium and 40 pg/g for tholkwn can be achleved. For the other elements, the limns of detection are between 1 pg/g and 100 ng/g. A m o d W more seiectlve separatlon of the Indicator radlonuelide of Th, =Pa, alkws improvement d the lknit d detecth for Th by a factor up to 5. Thls technique was appHed lo the analysis of high-purity molybdenum, and the results of a number of elements were compared with those of other technlques.

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Section: Introductionmentioning

confidence: 99%

Determination of uranium, thorium, and 18 other elements in high-purity molybdenum by radiochemical neutron activation analysis

Theimer¹,

Kriváň²

1990

Anal. Chem.

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Determination of some trace elements in high‐purity tantalum metal by thin‐film x‐ray fluorescence spectrometry

Eddy

Balaes

1988

X-Ray Spectrometry

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The determination of niobium, molybdenum, tungsten, iron and titanium in tantalum metal is described. After dissolution of the metal a d extraction of the tantalum by a chromatographic method using tributyl phosphate, the trace elements are determined on thin-film samples by x-ray fluorescence spectrometry. The thin-film samples are prepared either by spotting the sample solutions directly on to filter-paper or by coprecipitation with indium. The limits of detection on the thin film are 0.05-0.7 pg, depending on the element being measured.

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Analysis of tantalum by ICP-AES involving trace-matrix separation

Kriváň

Hausbeck

Wilhartitz

et al. 1991

Fresenius J Anal Chem

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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

Cited by 16 publications

References 28 publications

Determination of uranium, thorium, and 18 other elements in high-purity molybdenum by radiochemical neutron activation analysis

Determination of uranium, thorium, and 18 other elements in high-purity molybdenum by radiochemical neutron activation analysis

Determination of some trace elements in high‐purity tantalum metal by thin‐film x‐ray fluorescence spectrometry

Analysis of tantalum by ICP-AES involving trace-matrix separation

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