Colorimetric Determination of Niobium in Presence of Tantalum

Bukhsh, M.N.; Hume, David N.

doi:10.1021/ac60097a036

Cited by 17 publications

(3 citation statements)

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“…In this set of eight determinations I) were dissolved and accurately measured aliquots were used for individual samples. 1 Weight of niobium in each tantalum sample was calculated by using average of 8 determinations for metal F, 44.4 p.p.m., with a standard deviation of 0.7 p.p.m. the average error is 0.05 y of niobium which is equivalent to 0.5 p.p.m.…”

Section: Resultsmentioning

confidence: 99%

“…Separation of niobium from tantalum by ether extraction and subsequent determination by photometric measurements of a niobium thiocyanate complex are subject to error because tantalum tends to hydrolyze. Hume and coworkers (1,7) minimized the effect of tantalum by adding tartaric acid and changing the amount of reagents and the manner in which they were added. Their method was applicable at tantalum to niobium ratios as high as.…”

Section: Interferencesmentioning

confidence: 99%

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Spectrophotometric Determination of Niobium in Tantalum

Bergstresser¹

1959

Anal. Chem.

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an estimation unless only water is added before the pyridine-water reagent. The triphenylmethyl acetate suffers a rapid acid-catalyzed hydrolysis in comparison to the other esters present.indene (in pyridine), thiourea, urea, and triphenylmethane. Enols are acetylated to varying degrees, as are imides, hydrazides, and oximes. In ethyl acetate, double bonds and furan rings interfere, but triple bonds do not.Amines, phenols, mercaptans, and some oximes are quantitatively acetylated. ACKNOWLEDGMENTThe authors express their appreciation to J. P. LaPlante who performed some of the preliminary experiments on this problem. They also thank the following companies for the alcohol samples they supplied: The Dow Chemical, Eastman Chemical Products, General Aniline and Film, Pennsalt Chemicals, and Quaker Oats. The Lucidol Division of Wallace and Tiernan generously supplied the two samples of hydroperoxides used.

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Section: Resultsmentioning

confidence: 99%

Section: Interferencesmentioning

confidence: 99%

Spectrophotometric Determination of Niobium in Tantalum

Bergstresser¹

1959

Anal. Chem.

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“…Gelatin acts as a protective colloid to prevent the precipitation of toluidine blue in the determination of copper (63). The addition of tartaric acid to the reagent and a change in the order of addition eliminates the interference of tantalum in the determination of niobium with thiocyanate (81). The substitution of pyridine for ammonia gives a more stable color using dimethylglyoxime and iron(II) and facilitates extraction with chloroform (470).…”

Section: Chemistrymentioning

confidence: 99%