Quantitative Analysis of Niobium and Tantalum in Ores by Fluorescent X-Ray Spectroscopy

Campbell, W. J.; Carl, H. F.

doi:10.1021/ac60089a004

Cited by 46 publications

(10 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…successive dilutions) to improve the accuracy of the measurement. 61 According to the IUPAC document, when the linearity of the calibration curve could be ensured, a single level addition could be applied to the SAM for quantitative analysis. 32 Therefore, single level addition SAM could be a practical approach for ICP-MS analysis, by taking into consideration the fact that the majorities of present commercial ICP-MS instruments could provide signal intensities for the elements covering a linearity range of even over nine orders of magnitude.…”

Section: Introductionmentioning

confidence: 99%

Applications and Uncertainty Estimation of Single Level Standard Addition Method ICP-MS for Elemental Analysis in Various Matrix

Zhu

Nakano

Wang³

et al. 2018

ANAL. SCI.

View full text Add to dashboard Cite

The standard addition method (SAM) based on gravimetric sample preparation was investigated as an approach for the removal or cancelling of matrix effects in measurements by inductively coupled plasma mass spectrometry (ICP-MS). Deduction of the equations and experimental confirmation of the method are both given in the present work. After measuring both spiked and non-spiked samples by ICP-MS, the concentration of an element could be calculated based on the signal intensity ratio to an internal standard. A practical example was provided for the measurement of Fe in a certified reference material (CRM), i.e. NMIJ CRM 7512-a (milk powder). The validity of the method had been confirmed by the results of international comparisons with various kinds of matrix, including bioethanol, human serum, biodiesel fuel, drinking water, infant formula milk power, and seafood. The suggested method had been applied to measurements of multiple elements in three CRMs, including tap water, milk powder, and tea leave powder, respectively.

show abstract

Section: Introductionmentioning

confidence: 99%

Applications and Uncertainty Estimation of Single Level Standard Addition Method ICP-MS for Elemental Analysis in Various Matrix

Zhu

Nakano

Wang³

et al. 2018

ANAL. SCI.

View full text Add to dashboard Cite

show abstract

“…Kelly et al discussed the priority for the use of SAM beyond the field of polarography noting its use in emission spectrography by Harvey, reported in 1950 [17]. However, their analysis of priority between Campbell and Carl’s use in X-ray fluorescence (1954) [18] and Chow and Thompson’s use in flame photometry (1955) [19] is rendered pointless in the light of Chow and Thompson’s reference to Smales [20] (their reference [10]). The incorrect priority given to Chow and Thompson’s work was first stated in 2008 [21].…”

Section: Methods Of Standard Additionsmentioning

confidence: 99%

Origins of the method of standard additions and of the use of an internal standard in quantitative instrumental chemical analyses

Burns

Walker²

2019

Anal Bioanal Chem

View full text Add to dashboard Cite

The origin of the method of standard additions (SAM) and of the use of internal standard (IS) in instrumental chemical analysis and their spread into other areas has been reviewed. Recorded applications of IS range from flame spectroscopy in 1877 through multiple techniques to current use in NMR and standard additions with isotopically labelled internal standards in hyphenated techniques. For SAM, applications stemmed from polarography in 1937 and spread to most instrumental methods. Some misconceptions on priorities are corrected.

show abstract

“…As pointed out in the authors' original paper (5), the determination of low concentrations of tantalum oxide was restricted because of low intensities and insufficient resolution of interfering spectral lines. At that time the only practical solution to the interference problem was to excite the tantalum spectrum at 18 kv., a value below the critical voltage for the niobium K spectrum (£).…”

Section: Instrumentationmentioning

confidence: 99%

“…The analysis of niobium and tantalum ores has been performed successfully by fluorescent x-ray spectrographic methods (5,7), and recently both equipment and techniques have been considerably improved. Therefore, a rather intensive study of the effects of impurities and sample preparation on the x-ray spectrographic method was undertaken.…”

mentioning

confidence: 99%

Fluorescent X-Ray Spectrographic Determination of Tantalum in Commercial Niobium Oxides

Campbell¹,

Carl²

1956

Anal. Chem.

Self Cite

View full text Add to dashboard Cite

Recent modifications in fluorescent x-ray spectrographic instrumentation permit the resolution of the tantalum Lai line from the usual interfering lines without a prohibitive loss of intensity. Tantalum La¡ line intensities as high as 750 counts per second can be obtained from a sample of 5% tantalum oxide in niobium oxide by the use of a molybdenum target x-ray tube, a quartz analyzing crystal, and a 4-inch Soller slit collimator.The residual tantalum content of "high-purity" niobium oxide was determined by use of standards prepared from tantalum-free zirconium oxide. Hand-mixed samples, when properly prepared, are as suitable as chemically precipitated samples. The effects of possible impurities, such as stannic oxide, ferrous oxide, titanium dioxide, and sodium sulfate on the analysis were calculated from adsorption data and determined experimentally. Only titanium dioxide was found in commercial niobium oxides in amounts that would result in a measurable analytical error.Fluorescent x-ray spectrography is a rapid and reliable method of analysis. It has an accuracy within ±5% of the amount present in the usual concentration range of 0.5 to 10% tantalum oxide and a lower limit of detection of approximately 0.03% tantalum oxide, and requires an average time per analysis of about 10 minutes, after preparation of standards. DURING the past several years the x-ray laboratory of the Eastern Experiment Station, Bureau of Mines, has received numerous requests to determine the tantalum content of commercial grades of niobium oxides. A survey of the literature indicated a need for a suitable method of analyzing such samples.

show abstract

Quantitative Analysis of Niobium and Tantalum in Ores by Fluorescent X-Ray Spectroscopy

Cited by 46 publications

References 6 publications

Applications and Uncertainty Estimation of Single Level Standard Addition Method ICP-MS for Elemental Analysis in Various Matrix

Applications and Uncertainty Estimation of Single Level Standard Addition Method ICP-MS for Elemental Analysis in Various Matrix

Origins of the method of standard additions and of the use of an internal standard in quantitative instrumental chemical analyses

Fluorescent X-Ray Spectrographic Determination of Tantalum in Commercial Niobium Oxides

Contact Info

Product

Resources

About