Analysis of Aluminous Ore by Means of Spark Spectra

Churchill, J. R.; Russell, R. G.

doi:10.1021/i560137a005

Cited by 28 publications

(3 citation statements)

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“…Diffraction may be influenced by the recognized factors discussed by Brosky (S), Kay (<? ), and Klug et al (7). Absorption limitations already discussed in this paper may relate to the effect of associated crystallites in a mixture on conformity of transmitted intensities to the range of linearity of the Geiger tube.…”

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confidence: 64%

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Analysis of Bauxite Exploration Samples

Black¹

1953

Anal. Chem.

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confidence: 64%

“…To analyze them chemically, even by short-cut methods, has always been slow and expensive. A spectrographic method was described by Churchill and Russell (7), but x-ray diffraction appeared more promising for our purpose because it gives information on the compounds present, rather than only on the elements or chemical groups.…”

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confidence: 99%

Analysis of Bauxite Exploration Samples

Black¹

1953

Anal. Chem.

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“…The practical availability of adequate quantities of sample to prepare briquets routinely for excitation appeared to exclude this technique as applied to the analysis of minute quantities of ash matter, however. Alkaline salts are among substances commonly used as buffers in spectrochemical analysis (3,5,7,8,19). Some investigators have used lithium carbonate as a common matrix substance for the analysis of inorganic substances.…”

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Ash Residues from Petroleum Catalytic Cracking Feed Stocks

Gunn¹,

Powers²

1952

Anal. Chem.

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The rate of nitrogen flow through the apparatus should be sufficiently rapid to sweep the system completely free of hydrogen sulfide in a reasonable time. Nitrogen flow rates as high as 500 ml. per minute have been employed without loss of sulfide. However, rates of 100 to 200 ml. per minute are entirely adequate.Slower rates require excessively long times to ensure complete transfer of hydrogen sulfide. • LITERATURE CITED

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The spectrographs determination of trace elements in the cathode layer ARC by the variable internal standard method

Scott¹

1946

J. Chem. Technol. Biotechnol.

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The use of iron as the variable internal standard for the determination of trace elements in the cathode layer are, when the iron varies from two to one hundred per cent of ferric oxide, is discussed. Davidson and Mitchell's method, which requires one trace element working curve of fixed iron content and a correction curve for variation of iron content, is examined. Straight line working curves, of slope approximately unity up to at least five hundred parts per million, are obtained for most of the trace element lines when log intensity ratio, corrected for background, is plotted against log concentration, the curves for different iron contents being parallel but vertically displaced. Straight line correction curves are obtained by plotting this separation of the working curve, due to variation in iron content, against log concentration of iron. Two shortened methods for the derivation of the curves are proposed: in the first, the working and correction curves fan be prepared from a standard material by a single determination of the log intensity ratio of the trace element and internal standard lines, corrected for background; the second employs an observed working curve and an arbitrary correction curve. In the concentration ratio method, in which the working curve itself makes allowance for the variation in internal standard content, the log intensity ratio is plotted against the log concentration ratio and this method has similar limitations to the first shortened method.

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Analysis of Aluminous Ore by Means of Spark Spectra

Cited by 28 publications

References 1 publication

Analysis of Bauxite Exploration Samples

Analysis of Bauxite Exploration Samples

Ash Residues from Petroleum Catalytic Cracking Feed Stocks

The spectrographs determination of trace elements in the cathode layer ARC by the variable internal standard method

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