Determination of Primary Mineral Content and Calcium Sources in Forest Soils using Electron Probe Microanalysis Mapping and Cluster Analysis

2019 ◽  
Vol 83 (6) ◽  
pp. 1830-1841 ◽  
Author(s):  
Scott W. Bailey ◽  
Donald S. Ross ◽  
Nico Perdrial ◽  
Michael Jercinovic ◽  
Jeffrey Webber ◽  
...  
Keyword(s):  
Cluster Analysis ◽  
Forest Soils ◽  
Electron Probe Microanalysis ◽  
Electron Probe ◽  
Mineral Content ◽  
Primary Mineral ◽  
Calcium Sources ◽  
And Cluster Analysis

scholarly journals DETERMINATION OF IODINE CONCENTRATION AND DISTRIBUTION IN RAT THYROID FOLLICLES BY ELECTRON-PROBE MICROANALYSIS

1969 ◽  
Vol 43 (1) ◽  
pp. 115-121 ◽  
Author(s):  
William L. Robison ◽  
David Davis
Keyword(s):  
Sample Preparation ◽  
Electron Probe Microanalysis ◽  
Electron Probe ◽  
Freeze Drying ◽  
Iodine Concentration ◽  
Sodium Concentration ◽  
Thyroid Glands ◽  
The Mean ◽  
Rat Thyroid

The concentration and the distribution of iodine in various sized follicles of rat thyroid glands have been analyzed by electron-probe microanalysis. The results of the iodine analysis were grouped according to uncorrected lumen diameter size. No significant differences in iodine concentration were observed among the various size categories. When the results for all follicles from a given sample were pooled, the standard error of the mean was approximately 4%. Usually 40–50 follicles per animal were analyzed. The concentration of iodine ranged from 0.9 to 2.1% by weight among individual animals. Scanning pictures and step-scan analysis showed the iodine distribution to be quite uniform across the colloid area. Several techniques of sample preparation were used; they produced no significant differences in the iodine concentrations observed. Sodium concentration, also determined in all samples, was found to vary from 2 to 9% by weight. Because of the mobility of the sodium ion, its distribution was greatly affected by the method of sample preparation. The technique that best preserved the natural chemistry of the sample was that of freezing the tissue, sectioning, and then freeze-drying.

Absorption Correction Curves Obtained from Measurements of the Production of X-Rays as a Function of Depth

1972 ◽  
Vol 16 ◽  
pp. 198-205
Author(s):  
J.D. Brown ◽  
L. Parobek
Keyword(s):  
Electron Probe Microanalysis ◽  
Electron Probe ◽  
X Rays ◽  
Matrix Elements ◽  
X Ray ◽  
Absorption Correction ◽  
Correction Equations

AbstractMeasurements of x-ray production as a function of depth in a sample (ϕ(ρz) curves) are fundamental to the determination of the quantitative equations for relating x-ray intensity to composition in electron probe microanalysis. These ϕ(ρz) curves have been measured for four different voltages and a number of different tracers in aluminum, copper, silver arid gold as matrix elements. From these ϕ(ρz) curves the absorption correction curves (f(x) curves) can be calculated. Such curves have been obtained and comparison is made with the absorption correction equations of Philibert. The effect of a tilted sample on the absorption correction is also discussed.

Determination of the mean size of submicron particles by electron probe microanalysis

1995 ◽  
Vol 24 (1) ◽  
pp. 13-18 ◽  
Author(s):  
A. Berner ◽  
I. Levin ◽  
L. Klinger ◽  
D. G. Brandon
Keyword(s):  
Electron Probe Microanalysis ◽  
Electron Probe ◽  
Submicron Particles ◽  
Mean Size ◽  
The Mean

Composition of Garnet in Anorthosite–Charnockite Suites: Bias and Precision in Electron-Probe Microanalysis

1973 ◽  
Vol 10 (8) ◽  
pp. 1257-1266 ◽  
Author(s):  
K. Schrijver
Keyword(s):  
Electron Probe Microanalysis ◽  
Electron Probe ◽  
Physical State ◽  
Total Iron ◽  
Electron Probe Microanalyzer ◽  
Unknown Species ◽  
Compositional Homogeneity

The composition of garnet in each of 11 specimens from anorthosite–charnockite suites (Marcy Massif, Morin Complex, Lac-Croche Complex) has been determined by electron-probe microanalyzer. All analyses include Si, Al, Fe, Mn, Mg, and Ca. The range of FeO (total iron as Fe2+) is from 26.5 to 34 wt.%; MnO from 0.5 to 2, MgO from 0.5 to 5, and CaO from 7 to 9.5 wt.%. TiO2 is present in very small amounts at most ([Formula: see text]?). The major end member molecule in all specimens is almandine.Bias and precision of the analysis have been estimated: (1) by replicate determination of the composition of a garnet standard in each analytical run on each of the unknown species and (2) by duplicate determination of the garnet species in each rock specimen.In general, inclusion of a known species, similar in composition and physical state to the unknown species, in each analytical run on an unknown will provide estimates of bias applicable to individual analyses as well as an overall estimate of bias applicable to the mode and circumstances of the particular series of runs on the electron-probe microanalyzer. The reliability of the estimates of bias so obtained depends mainly on the compositional homogeneity of both known and unknown species.

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