Colorimetric Determination of Columbium and Tungsten in High-Temperature Alloys

Geld, Isidore; Carroll, J W

doi:10.1021/ac60033a026

Cited by 31 publications

(8 citation statements)

References 19 publications

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“…Freund et al (1951) reviewed the effect of the concentration of free acid, chloride and chlorostannous ion on the formation of the thiocyanate complex and recommended the optimum conditions. The same authors and earlier Geld and Carroll (1949), suggested the reduction of tungsten(VI) with stannous chloride at an elevated temperature, either by boiling or by placing the solution in a boiling waterbath. They have inferred that the interference of molybdenum in the determination of tungsten by thiocyanate is dependent not only on the amount of molybdenum but also on that of iron present in the sample solution.…”

Section: Spectrophotometry and Fluorometrymentioning

confidence: 72%

Analysis of tungsten in low grade ores and geological samples

et al. 1996

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Abslract. The determination of tungsten in low grade ores and geological samples is one of the most difficult and challenging tasks. Many of the associated elements, especially molybdenum interfere. These have to be overcome by suitable methods of separation or suppression of the interfering elements. Since the concentrations are low, instrumental methods are preferred over the classical methods. Thus spectrophotometry, fluorometry, atomic absorption spectrometry, atomic emission spectrometry, X-ray fluorescence, neutron activation analysis, electro analytical methods and chromatography are preferred. These are discussed in this review.

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Section: Spectrophotometry and Fluorometrymentioning

confidence: 72%

Analysis of tungsten in low grade ores and geological samples

et al. 1996

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“…In the somewhat related field of x-rays, papers by Alexander and Klug (2), Geisler and Hill (30), and Duwrez and Odell (25) indicate that the nonferrous analytical chemist has a new technique available which may solve certain specific problems.…”

Section: Discussionmentioning

confidence: 99%

Ferrous Metallurgy

Beeghly¹

1950

Anal. Chem.

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PRACTICALadvances in ferrous analytical chemistry result from a correlation of available information with experience in selecting the most likely approach to solution of a specific problem. Frequently these advances are made under the compulsion of need for new or better data on experimental operations or new experimental alloys, and the chemist utilizes the store of basic information in the literature along with new reagents and tools as a basis for devising the method best suited to his requirements and the working facilities at his disposal. BASIC INFORMATION

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“…Still other changes have been made in attempts to shorten the method and/or obtain better precision (Geld and Carroll, 1949;Gentry and Sherrington, 1948). Extraction of the tungsten thiocyanate complex ion with an immiscible solvent results in increased sensitivity (Sandell, 1950), and heating the reaction mixture decreases the time required to form the complex ion (Poluektov, 1941).…”

Section: Introductionmentioning

confidence: 99%

A field method for the determination of tungsten in soils

Ward¹

1951

Circular

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Colorimetric Determination of Columbium and Tungsten in High-Temperature Alloys

Cited by 31 publications

References 19 publications

Analysis of tungsten in low grade ores and geological samples

Analysis of tungsten in low grade ores and geological samples

Ferrous Metallurgy

A field method for the determination of tungsten in soils

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