Emission Spectrometric Determination of Oxygen in Niobium Metal

Evens, Floyd Monte; Fassel, Velmer A.

doi:10.1021/ac60176a002

Cited by 18 publications

(10 citation statements)

References 7 publications

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“…Previous work in gas and liquid chromatography with unsorbed solutes (3,11,12) has indicated that the curves of A vs. v for different values of p when plotted on a logarithmic scale, are parallel over at least a 100-fold range of v. At a constant value of v, A increases with p, at least up to a certain limiting value of p.…”

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confidence: 94%

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Effect of the column to particle diameter ratio on the dispersion of unsorbed solutes in chromatography

Knox¹,

Parcher²

1969

Anal. Chem.

251

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The dispersion of unsorbed solutes eluted by water through 150-cm columns packed with spherical glass beads has been reexamined using large beads of various sizes and columns of different diameters. It is shown that the dependence of the plate height on velocity, which is similar to that previously found, follows the empirical equation h = (1/2 X + 1/ )-1 where the reduced plate height h = H/dp, and the reduced fluid velocity v = udp/Dm. The optimum value of n is 0.3 ± 0.1. Plots of log h vs. log v were

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confidence: 94%

“…Much theoretical work has been carried out on the dependence of H upon fluid velocity and column parameters, see (7) and (2), and attempts have been made to define the requirements for minimum time analysis (7,(3)(4)(5). There is still, however, a lack of high quality experimental data.…”

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confidence: 99%

Effect of the column to particle diameter ratio on the dispersion of unsorbed solutes in chromatography

Knox¹,

Parcher²

1969

Anal. Chem.

251

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“…Short-cut methods are desired. In silicate determinations, the phosphate interference can be avoided by proper pH control (5) or by destroying the molybdophosphoric acid complex with oxalic acid (9).…”

Section: Thesementioning

confidence: 99%

Comparative Study on Determination of Oxygen in Vanadium Metal.

Fassel¹,

Dallmann²,

Skogerboe³

et al. 1962

Anal. Chem.

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On leaching the melt, most constituents are rendered insoluble either as hydroxides or calcium salts, except for rhenium and a small amount of molybdenum. A rather complete separation of the elements is obtained, as shown by the fact that no precipitate is formed in the filtrate from rocks on adjusting the pH to 7.5 with ammonium hydroxide. About 680 and 440 Mg. of Mo03, respectively, were found in the filtrate when 0.5 and 0.3 gram of MoS2 were tested; 50 Mg. and less than 5 Mg• of Mo03 were found when 0.5 gram of W-l was taken to which 1 mg. and 100 Mg• of Mo03, respectively, had been added. Table V. Test of Procedure on Mixtures of W-l and Molybdenite Containing 70 p.p.m. of Re Mix taken, gram Re in mix,__Re recovered, µg. MoS2 W-l Mg.

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“…Several chambers for the arc-extraction of gases from metals have been described. The typical chamber consists of a vacuum tight enclosure containing a horizontal rotating electrode stage with which a number of sample electrodes can be rotated into arcing position (3). Regardless of whether a gas-chromatographic or spectrometric analytical method is used, it is advantageous in theory to keep the chamber volume small to reduce dilution of the extracted gases.…”

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confidence: 99%

“…The electrode stage is rotated in a vertical plane through a gear set [2] (recessed into cover plate) and knob [3], The chamber was used initially with the 5-electrode stage [4], The 10-electrode stage [5] was constructed later and observations with it suggested that a 15-electrode stage could very probably be accommodated in the same compact chamber without danger of arc-over to adjacent electrodes. A telescoping, sample loading arm [6], which penetrates the rear of the chamber [7], provides storage for ten samples.…”

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confidence: 99%