Preparation and Characterization of Three New NBS Fly Ash Standard Reference Materials

1985 ◽  
Vol 65 ◽  
Author(s):  
Howard M. Kanare
Keyword(s):  
Fly Ash ◽  
Reference Materials ◽  
Chemical Elements ◽  
Standard Reference Materials ◽  
Physical Analysis ◽  
National Bureau ◽  
Loss On Ignition ◽  
New Methods ◽  
The U.S

Three new fly ash standard reference materials (SRM's) have been produced by CTL under contract with the U.S. National Bureau of Standards (NBS). Each unit of the SRM's consists of approximately ten grams of well-blended fly ash hermetically sealed in a glass vial. Twenty-thousand vials of each SRM were produced. The SRM's will be certified for major and minor chemical elements, loss on ignition, and for the percentage residue on the No. 325 standard sieve. The SRM's are suitable for use in developing new methods of chemical and physical analysis, for checking the performance of instruments and analysts, and for research into the composition and properties of fly ash.

X-Ray Powder Diffraction For Studying the Mineralogy of fly ash

1987 ◽  
Vol 113 ◽  
Author(s):  
Gregory I. McCarthy
Keyword(s):  
Fly Ash ◽  
Powder Diffraction ◽  
Reference Materials ◽  
Standard Reference Materials ◽  
National Bureau ◽  
Fly Ashes ◽  
X Ray ◽  
High Calcium

ABSTRACTA brief summary of the use of x-ray powder diffraction for studying the mineralogy of fly ash is presented. Mineralogies of low-, intermediate- and high-calcium fly ashes are discussed and illustrated by results from XRD characterization of U.S. National Bureau of Standards fly ash Standard Reference Materials.

Elemental concentrations in the National Bureau of Standards' environmental coal and fly ash Standard Reference Materials

1975 ◽  
Vol 47 (7) ◽  
pp. 1102-1109 ◽  
Author(s):  
J. M. Ondov ◽  
W. H. Zoller ◽  
Ilhan. Olmez ◽  
N. K. Aras ◽  
G. E. Gordon ◽  
...  
Keyword(s):  
Fly Ash ◽  
Reference Materials ◽  
Standard Reference Materials ◽  
National Bureau ◽  
Elemental Concentrations

scholarly journals Standard Reference Materials for Analysis of Dietary Supplements

2008 ◽  
Vol 91 (6) ◽  
pp. 1298-1302 ◽  
Author(s):  
Katherine E Sharpless ◽  
David L Duewer
Keyword(s):  
Quality Control ◽  
Dietary Supplements ◽  
Method Validation ◽  
Drug Administration ◽  
Reference Materials ◽  
Food And Drug Administration ◽  
Standard Reference Materials ◽  
Quality Control Materials ◽  
The U.S

Abstract National Institute of Standards and Technology (NIST), in collaboration with the National Institutes of HealthOffice of Dietary Supplements and the U.S. Food and Drug Administration, is producing Standard Reference Materials (SRMs) for dietary supplements. These and other natural-matrix SRMs should be used in method validation, characterization of in-house quality control materials, and to establish traceability.

X-Ray Powder Diffraction Study of NBS Fly Ash Standard Reference Materials

1988 ◽  
Vol 3 (3) ◽  
pp. 156-161 ◽  
Author(s):  
Gregory J. McCarthy ◽  
Diane M. Johansen
Keyword(s):  
Fly Ash ◽  
Powder Diffraction ◽  
Reference Materials ◽  
Diffuse Scattering ◽  
Standard Reference Materials ◽  
Phase Assemblage ◽  
National Bureau ◽  
X Ray ◽  
Tricalcium Aluminate ◽  
Ferrite Spinel

AbstractThe fly ash Standard Reference Materials (SRMs) issued by the U.S. National Bureau of Standards have been studied by X-ray powder diffraction (XRD). Based on observations of large diffuse scattering maxima in their X-ray diffractograms, it was evident that all of the ashes had a high glass content. SRM 1633a and 2689, derived from the combustion of bituminous coal, contained different amounts of quartz, mullite, hematite and ferrite spinel (magnetite). SRM 2891, derived from subbituminous coal had quite a different chemical composition and a more complex crystalline phase assemblage, that included these four phases plus anhydrite, tricalcium aluminate, lime, periclase and minor phases. SRM 2690, also derived from subbituminous coal, had only quartz, mullite and ferrite spinel as detectable phases in its diffractogram. Analytical CaO is an important factor in determining the phase assemblage; SRM 2691 had 25.8 wt%, SRM-2690 had 8.0%, and the ash derived from bituminous coals had only 1.6-3.0%. The changing composition of the glass phases in the SRMs is detected in a shift in the position and shape of the diffuse scattering maximum in the diffractograms. Use of an internal intensity standard permitted quantitative comparisons of the relative amounts of crystalline phases among the four fly ash SRMs.

New Standard Reference Materials for X-Ray Powder Diffraction

1982 ◽  
Vol 26 ◽  
pp. 45-51
Author(s):  
Camden R. Hubbard
Keyword(s):  
Reference Materials ◽  
Nuclear Power ◽  
Standard Reference Materials ◽  
Measurement Technology ◽  
National Bureau ◽  
State Governments ◽  
X Ray ◽  
Ferrous Metals ◽  
Research Organizations ◽  
Improve Measurement

Standard Reference Materials (SRMs) from the National Bureau of Standards are samples or artifacts certified for one or more particular parameters. The NBS has produced SRHs since 1905 to aid commerce, to improve measurement technology and to assist in the enforcement of regulations. Today nearly 900 different SRHs are available to serve major segments of industry such as ferrous metals, nonferrous metals, mining, glass, primary chemicals, computer, nuclear power and electronics. In addition to the industrial customers, major SRM users include both federal and state governments, universities and nonprofit research organizations.

Measurement and Standard Reference Materials in Clinical Chemistry

1968 ◽  
Vol 14 (10) ◽  
pp. 929-943 ◽  
Author(s):  
Donald S Young ◽  
Thomas W Mears
Keyword(s):  
Uric Acid ◽  
Reference Materials ◽  
Measurement System ◽  
High Purity ◽  
Clinical Chemistry ◽  
Standard Reference Materials ◽  
National Bureau ◽  
Additional Component ◽  
Clinical Laboratories ◽  
Chemical Measurements

Abstract The concepts of the measurement system based upon four parameters—length (meter), mass (kilogram), time (second), and temperature (kelvin)—are developed. The proper daily operation of an analytic laboratory depends upon these basic measurements and others derived from them, e.g., the liter. An additional component of chemical measurement which directly influences accuracy is the purity of the standards and reagents employed. The standard reference materials program of the National Bureau of Standards provides a central source of guaranteed high-purity reference materials which are available to all. The reliability of chemical measurements should increase as new standard reference materials such as cholesterol, uric acid, urea, and creatinine are utilized to standardize methods and to calibrate instruments in the clinical laboratories of this country.

Characterization of standard reference materials for obtaining instrumental line profiles

1998 ◽  
Vol 13 (4) ◽  
pp. 210-215 ◽  
Author(s):  
Matteo Leoni ◽  
Paolo Scardi ◽  
J. Ian Langford
Keyword(s):  
Reference Materials ◽  
Profile Analysis ◽  
Standard Reference Materials ◽  
Line Profile Analysis ◽  
Line Profiles ◽  
Instrumental Line ◽  
Geometrical Effects ◽  
Structural Imperfections

Standard Reference Materials (SRMs) for determining instrumental line profiles should not exhibit measurable broadening from structural imperfections, but owing the effects of sample transparency and other geometrical effects, the quality of possible SRMs cannot necessarily be assessed satisfactorily with data from a conventional divergent-beam diffractometer. The problem of transparency can be avoided if parallel beam optics is used, as for instance on a synchrotron radiation powder diffraction station employing Parrish (Soller-type receiving slit assembly) geometry. Data from such a configuration are used to compare three SRMs commonly used in line-profile analysis.

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