Complete chemical analysis of sand with a SiO2 concentration of less than 95%

1984 ◽  
Vol 41 (7) ◽  
pp. 313-315
Author(s):  
S. G. Sushkova ◽  
E. A. Didenko
Keyword(s):  
Chemical Analysis ◽  
Sio2 Concentration ◽  
Complete Chemical Analysis

The Classification of a Glassy Rock: The Pitchstone of Wormit, Fifeshire

1929 ◽  
Vol 66 (3) ◽  
pp. 116-121
Author(s):  
S. J. Shand
Keyword(s):  
Chemical Composition ◽  
Chemical Analysis ◽  
Similar Chemical Composition ◽  
Reliable Indication ◽  
Similar Chemical ◽  
Complete Chemical Analysis

In most systems of petrography the glassy rocks are treated in a very casual way. The names which are commonly given to them, such as obsidian, pitchstone, perlite, vitrophyre, and the like, afford no reliable indication of composition; and when a rock is partly crystalline and partly glassy, the composition of the glass is often assumed, quite unwarrantably, to be the same as that of the crystals. It is only in the Norm classification that vitreous rocks fall unfailingly into the same compartments as holocrystalline ones of similar chemical composition; and before any rock can be classified by this method, it is necessary to have a complete chemical analysis of it; which is, for many workers, a serious obstacle.

FPT: An Integrated Fundamental Parameters Program for Broadband EDXRF Analysis without a Set of Similar Standards

1982 ◽  
Vol 26 ◽  
pp. 355-368 ◽  
Author(s):  
D. A. Gedcke ◽  
L. G. Byars ◽  
N. C. Jacobus
Keyword(s):  
Quantitative Analysis ◽  
Chemical Analysis ◽  
Sample Analysis ◽  
X Ray ◽  
Fundamental Parameters ◽  
Unknown Sample ◽  
Edxrf Analysis ◽  
Accurate Quantitative Analysis ◽  
Complete Chemical Analysis ◽  
Repetitive Analysis

The x-ray fluorescence (XRF) method is well known for its capability to perform fast and accurate quantitative analysis for all elements with atomic numbers greater than ten. Energy dispersive x-ray fluorescence (EDXRF) adds to this capability the benefit of quick qualitative analysis, due to its simultaneous sensitivity to all the elements. The method has the potential for rapid and complete chemical analysis of any sample which arrives on the analytical chemist's doorstep. Although the method has been a productive tool for fast and accurate repetitive analysis of similar samples, its applicability to unique unknowns has been rather limited. The limitation arises from the usual need to calibrate the instrument's response with a set of 6 to 12 standards, whose compositions must be similar to the unknown sample. Anyone who has struggled to develop and maintain such a suite of accurately certified standards knows that a great deal of effort and expense is involved. This effort is well justified when the analyst expects to analyze the same type of material frequently over an extended tine period. However, for a unique sample analysis, the task of developing a suite of similar standards simply makes the analysis impractical. What is needed is a method that requires minimal standards, or uses no standards at all.

scholarly journals Complete Chemical Analysis of Carmagnola Hemp Hurds and Structural Features of Its Components

BioResources ◽  
2013 ◽  
Vol 8 (2) ◽  
Author(s):  
Stefano Gandolfi ◽  
Gianluca Ottolina ◽  
Sergio Riva ◽  
Giuseppe Pedrocchi Fantoni ◽  
Ilabahen Patel
Keyword(s):  
Chemical Analysis ◽  
Structural Features ◽  
Complete Chemical Analysis

Complete chemical analysis of airborne particulates

1975 ◽  
Vol 9 (12) ◽  
pp. 1099-1106 ◽  
Author(s):  
R. Dams ◽  
J. Billiet ◽  
C. Block ◽  
M. Demuynck ◽  
M. Janssens
Keyword(s):  
Chemical Analysis ◽  
Airborne Particulates ◽  
Complete Chemical Analysis

Aspects of microanalysis in a transmission electron microscope

1978 ◽  
Vol 36 (1) ◽  
pp. 510-511
Author(s):  
R. Sinclair ◽  
B.E. Jacobson
Keyword(s):  
Grain Size ◽  
Electron Beam ◽  
Electron Microscope ◽  
Chemical Analysis ◽  
Transmission Electron Microscope ◽  
Vapor Deposition ◽  
Critical Currents ◽  
X Ray ◽  
Fine Grain ◽  
Transmission Electron

INTRODUCTIONThe prospect of performing chemical analysis of thin specimens at any desired level of resolution is particularly appealing to the materials scientist. Commercial TEM-based systems are now available which virtually provide this capability. The purpose of this contribution is to illustrate its application to problems which would have been intractable until recently, pointing out some current limitations.X-RAY ANALYSISIn an attempt to fabricate superconducting materials with high critical currents and temperature, thin Nb3Sn films have been prepared by electron beam vapor deposition [1]. Fine-grain size material is desirable which may be achieved by codeposition with small amounts of Al2O3 . Figure 1 shows the STEM microstructure, with large (∽ 200 Å dia) voids present at the grain boundaries. Higher quality TEM micrographs (e.g. fig. 2) reveal the presence of small voids within the grains which are absent in pure Nb3Sn prepared under identical conditions. The X-ray spectrum from large (∽ lμ dia) or small (∽100 Ǻ dia) areas within the grains indicates only small amounts of A1 (fig.3).

Integrated morphometrical and electron energy loss image analysis in cytochemistry

1989 ◽  
Vol 47 ◽  
pp. 402-403
Author(s):  
W.C. de Bruijn ◽  
A.A.W. de Jong ◽  
C.W.J. Sorber
Keyword(s):  
Image Analysis ◽  
Acid Phosphatase ◽  
Chemical Analysis ◽  
Active Form ◽  
List Type ◽  
Type Number ◽  
Enzyme Cytochemistry ◽  
Related Data ◽  
Endogenous Peroxidase ◽  
Electron Energy Loss

One aspect of enzyme cytochemistry is, whether all macrophage lysosomal hydrolytical enzymes are present in an active form, or are activated upon stimulation. Integrated morphometrical and chemical analysis has been chosen as a tool to illucidate that cytochemical problem. Mouse peritoneal resident macrophages have been used as a model for this complicated integration of morphometrical and element-related data. Only aldehyde-fixed cells were treated with three cytochemical reactions to detect different enzyme activities within one cell (for details see [1,2]). The enzyme-related precipitates anticipated to be differentiated, were:(1).lysosomal barium and sulphur from aryl sulphatase activity,(2).lysosomal cerium and phosphate from acid phosphatase activity and(3).platinum/di-amino-benzidine( D A B) complex from endogenous peroxidase activity.

Sign in / Sign up

Export Citation Format

Share Document