Quantitative Determination of some Carbonate Minerals in Greenschist Facies Meta-volcanic Rocks

1972 ◽  
Vol 9 (1) ◽  
pp. 36-42 ◽  
Author(s):  
Calvert C. Bristol
Keyword(s):  
Standard Deviation ◽  
Quantitative Determination ◽  
Volcanic Rocks ◽  
Internal Standard ◽  
Greenschist Facies ◽  
Carbonate Mineral ◽  
Mineral Contents ◽  
X Ray ◽  
Fine Grained

X-ray powder diffraction methods, successful in quantitative determination of silicate minerals in fine-grained rocks, have been applied to the determination of calcite, dolomite, and magnesite in greenschist facies meta-volcanic rocks. Internal standard graphs employing two standards (NaCl and Mo) have been determined.Carbonate mineral modes (calcite and dolomite) for 6 greenschist facies meta-volcanic rocks obtained by the X-ray powder method have been compared to normative carbonate mineral contents calculated for the same rocks. This comparison showed a maximum variation of 7.7 wt.% between the X-ray modes and the normative carbonate mineral contents of the rocks. Maximum standard deviation for the X-ray modes of these rocks was equivalent to 4.4 wt.%.

The quantitative determination of minerals in some metamorphosed volcanic rocks by X-ray powder diffraction

1968 ◽  
Vol 5 (2) ◽  
pp. 235-242 ◽  
Author(s):  
Calvert C. Bristol
Keyword(s):  
Quantitative Determination ◽  
Powder Diffraction ◽  
Volcanic Rocks ◽  
Internal Standard ◽  
Amphibolite Facies ◽  
X Ray Diffraction ◽  
X Ray ◽  
Diffraction Determination

A method is described for the quantitative X-ray powder diffraction determination of minerals in metamorphosed volcanic rocks of the greenschist, epidote-amphibolite, and amphibolite facies. In this method the intensity of the (111) diffraction for a powdered metallic Cu internal standard was compared to the intensities of selected diffractions for minerals of each facies.Graphs relating X-ray diffraction intensities to concentrations were prepared for actinolite, albite, almandine, anthophyllite, biotite, chlorite (omega: 1.59), diopside, epidote, hornblende, muscovite (2M1), plagioclase (An30), and quartz.Results using this method are within [Formula: see text] of those obtained by Rosiwal analysis.

Determination of Uranium in High-Grade Uranium Concentrates by an X-ray Emission Spectrographic Method

1972 ◽  
Vol 26 (1) ◽  
pp. 57-59 ◽  
Author(s):  
Chester L. Jensen ◽  
Gretta S. Baur
Keyword(s):  
Standard Deviation ◽  
Internal Standard ◽  
High Grade ◽  
Dilute Acid ◽  
Acid Decomposition ◽  
X Ray ◽  
Dilute Acid Solution ◽  
Spectrographic Method ◽  
The Mean

A fast, precise, and accurate x-ray emission spectrographic method has been developed for the determination of uranium in high-grade (70% to 99% U3O8) uranium concentrates. No chemical separations are required. After acid decomposition, yttrium is added as an internal standard, and the uranium in dilute acid solution is determined by x-ray emission techniques. The standard deviation obtained for the average of the mean by analysis of six portions of the same sample is 0.03% U3O8. Such precision is equivalent to that of the more complicated titrimetric methods conventionally used.

Quantitative Determination of Kyanite in Kyanite Ores by X-Ray Diffraction

1957 ◽  
Vol 1 ◽  
pp. 59-72
Author(s):  
G. M. Faulring ◽  
R. D. Carpenter
Keyword(s):  
Quantitative Determination ◽  
Internal Standard ◽  
X Ray Diffraction ◽  
X Ray

AbstractThe amount of kyanite in samples obtained from magnetic and density separations of a kyanite ore was established by a quantitative X-ray diffraction procedure employing an internal standard. The accuracy of the results at low kyanite levels was improved by adding pure kyanite to the samples, analyzing these mixtures and extrapolating back to the lower level. The results were verified by X-ray diffraction analyses of synthetic mixtures containing amounts of kyanite approximately equal to that indicated in the ore samples. The percentage of error is estimated to be ±3per cent of the amount present in the range of 20 to 80 per cent kyanite.

Determination of alcohols in mixtures by 19F NMR spectroscopy using hexefluoroacetone reagent

1982 ◽  
Vol 47 (7) ◽  
pp. 1973-1978 ◽  
Author(s):  
Jiří Karhan ◽  
Zbyněk Ksandr ◽  
Jiřina Vlková ◽  
Věra Špatná
Keyword(s):  
Standard Deviation ◽  
Nmr Spectroscopy ◽  
Standard Method ◽  
Internal Standard ◽  
Internal Standard Method ◽  
Concentration Region ◽  
Experimental Conditions ◽  
Curve Method ◽  
Sample Preparation Procedure

The determination of alcohols by 19F NMR spectroscopy making use of their reaction with hexafluoroacetone giving rise to hemiacetals was studied on butanols. The calibration curve method and the internal standard method were used and the results were mutually compared. The effects of some experimental conditions, viz. the sample preparation procedure, concentration, spectrometer setting, and electronic integration, were investigated; the conditions, particularly the concentrations, proved to have a statistically significant effect on the results of determination. For the internal standard method, the standard deviation was 0.061 in the concentration region 0.032-0.74 mol l-1. The method was applied to a determination of alcohols in the distillation residue from an oxo synthesis.

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