Simultaneous Spectrophotometric Determination of Niobium and Tungsten.  Application to Complex Alloy and Stainless Steels

McDuffie, Bruce; Bandi, W. R.; Melnick, L.M.

doi:10.1021/ac60152a018

Cited by 16 publications

(3 citation statements)

References 23 publications

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“…trode substrate, washed with de-ionized water on a filter paper, and dried under vacuum for 12h, to be applied to the elemental analysis of C, H, N, and C1. The amount of incorporated WO3 was determined using thiocyanate as a complexing agent (10). After drying the stripped polypyrrole films as mentioned above, a weighed amount of the sample was immersed in 10 cm 3 of boiled 1M NaOH for 30 min to dissolve the incorporated oxide.…”

Section: Methodsmentioning

confidence: 99%

Incorporation of WO 3 into Polypyrrole, and Electrochemical Properties of the Resulting Polymer Films

Yoneyama

Shoji

1990

J. Electrochem. Soc.

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Electrochemical polymerization of pyrrole in electrolyte-free aqueous suspension of WO3 resulted in WO3-incorporated polypyrrole films containing ca. 83 weight percent of the oxide. The reduction of the resulting polypyrrole films caused the insertion of electrolyte cations into the films, indicating that the incorporated WOE worked as a fixed charge compensator for the oxidized polypyrrole. The amount of the incorporated WO3 was diminished by adding C10( to the deposition bath, the degree being dependent on the concentration of C10( relative to that of the suspended WO3. The electrochromic properties of the WO3-incorporated polypyrrole were investigated as a function of the amount incorporated to achieve dual electrochromism due to polypyrrole and the incorporated WO~.

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Section: Methodsmentioning

confidence: 99%

Incorporation of WO 3 into Polypyrrole, and Electrochemical Properties of the Resulting Polymer Films

Yoneyama

Shoji

1990

J. Electrochem. Soc.

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“…NIOBIUM AND TANTALUM Radiometric titration, using niobium-95 and tantalum-185, with cupferron was used for determination of these elements in steel (7). They wrere determined spectrophotometricallv as the thiocyanates (73,163,213). A combination of selective precipitation with cupferron and ion exchange on Dowe.x 1 was used to isolate these elements for final determination gravimetrically as the oxides or by the quinol and pyrogallol color methods, respectively (102).…”

Section: Nickelmentioning

confidence: 99%

Ferrous Metallurgy

Beeghly¹,

Pásztor²

1961

Anal. Chem.

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“…In addition to these simple applications, a few simultaneous determinations seem worth mentioning. Tungsten and niobium in alloys have been determined by measuring total absorbance due to niobium(V) and tungsten (V) thiocyanates, and measuring absorbance of the tungsten complex after destruction of the niobium complex by the addition of oxalate (403). Calcium and magnesium have been determined by measuring absorbance due to the chelates formed with Erichrome Black T, and absorbance after magnesium-EDTA lias been added to react with the calcium dye complex to give additional magnesium dye chelate and calcium-EDTA complex (428).…”

Section: Applicationsmentioning

confidence: 99%

Light Absorption Spectrometry

Mellon¹,

Boltz²

1960

Anal. Chem.

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The literature relevant to light absorption spectrometry for the period July 1957 to September 1959 has been sampled for this eighth in a series of reviews (422, 424)• In endeavoring to make a judicious selection of references primarily of interest to analytical chemists, mampapers of some relevance were omitted. The classification of subject matter again is chemistry, physics, and applications.Attention is directed to several publications devoted entirely, or in part, to spectrophotometric analysis. "Colorimetric Analysis" (12), "Colorimetric Determination of Non-Metals" (75), "Colorimetric Determination of Traces of Metals," third edition (574), and "Colorimetric Methods of Analysis," Volume IIA (628), are recent treatises. A "1959 Supplement to the Bibliography heteropoly formation was found only at pH 9 to 11 (640). Molybdosilicic acid with molybdenum-silicon ratios of 12:1, 6:1, and 2:1 has a yellow hue which increases with the number of molybdate groups present (551). The 1:1 heteropoly complex is colorless. A decrease in hue with time takes place at all pH values where the 12:1 complex exists, but this change is due to structural rearrangement rather than to decomposition. Molybdic acid forms 1:1, 1:2, and 2:1 complexes, respectively, with erythritol, mannitol, and gluconic acid. The erythritol and gluconic acid complexes exhibit most of the normal reactions of molybdates (545).

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Simultaneous Spectrophotometric Determination of Niobium and Tungsten. Application to Complex Alloy and Stainless Steels

Cited by 16 publications

References 23 publications

Incorporation of WO 3 into Polypyrrole, and Electrochemical Properties of the Resulting Polymer Films

Incorporation of WO 3 into Polypyrrole, and Electrochemical Properties of the Resulting Polymer Films

Ferrous Metallurgy

Light Absorption Spectrometry

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