Uncertainty limits for certified values of standard reference materials

1990 ◽  
Vol 338 (4) ◽  
pp. 411-413 ◽  
Author(s):  
John J. LaBrecque
Keyword(s):  
Reference Materials ◽  
Standard Reference Materials ◽  
Certified Values

NBS Plant Tissue Standard Reference Materials

1980 ◽  
Vol 63 (4) ◽  
pp. 806-808
Author(s):  
Robert Alvarez
Keyword(s):  
Reference Materials ◽  
Analytical Methods ◽  
Rice Flour ◽  
Accurate Method ◽  
Powdered Material ◽  
Reference Points ◽  
Standard Reference Materials ◽  
Common Reference ◽  
Definitive Method ◽  
Certified Values

Abstract NBS issues 6 Standard Reference Materials for use in determining nutrient and contaminant elements in plant tissues and agricultural food products. They are SRM 1571, Orchard Leaves; SRM 1573, Tomato Leaves; SRM 1575, Pine Needles; SRM 1570, Spinach; SRM 1567, Wheat Flour; and SRM 1568, Rice Flour. These SRMs are used to calibrate instrumentation, to determine accuracy of existing analytical methods, and to develop more accurate methods. The Certificate of Analysis for each SRM details the homogeneity of the powdered material, the minimum sample size to be used, the certified values for the elements with their uncertainties, and the noncertified values. A certified value is based either on concordant results by independent analytical methods or on results by a definitive method, i.e., an accurate method having identified, systematic errors. These certified values can serve as common reference points for comparison of data acquired over a long period by various investigators using a variety of methods.

Preconcentration of Trace Elements in Aluminum Alloys Using a Chelating Ion-Exchanger and Determination by ICP-AES

1989 ◽  
Vol 43 (7) ◽  
pp. 1132-1135 ◽  
Author(s):  
Jacques Dumont ◽  
Martin Côté ◽  
Joseph Hubert
Keyword(s):  
Trace Elements ◽  
Aluminum Alloys ◽  
Reference Materials ◽  
Atomic Emission ◽  
Ion Exchanger ◽  
Standard Reference Materials ◽  
Atomic Emission Spectrometer ◽  
Certified Values ◽  
Preconcentration Method ◽  
Good Agreement

The Hyphan resin, a chelating ion-exchanger, is used to preconcentrate several metals (Cd, Co, Cr, Cu, Fe, Mg, Mn, Ni, Ti, and Zn) in aluminum alloys, before analysis by ICP atomic emission. The recovery of the preconcentration procedure is 100% for most metals. The accuracy of the method is evaluated by analysis of ALCAN and NIST standard reference materials. The results are in good agreement with the certified values. The preconcentration method can be used in a batch or in a flow analyzer mode in conjunction with an ICP/atomic emission spectrometer.

Thermal behavior study of biodiesel standard reference materials

2011 ◽  
Vol 106 (2) ◽  
pp. 347-354 ◽  
Author(s):  
Eveline De Robertis ◽  
Gabriela F. Moreira ◽  
Raigna A. Silva ◽  
Carlos A. Achete
Keyword(s):  
Thermal Behavior ◽  
Reference Materials ◽  
Standard Reference Materials ◽  
Behavior Study

Two new marine sediment standard reference materials (SRMs) for the determination of organic contaminants

2004 ◽  
Vol 378 (5) ◽  
pp. 1251-1264 ◽  
Author(s):  
Stephen A. Wise ◽  
Dianne L. Poster ◽  
Michele M. Schantz ◽  
John R. Kucklick ◽  
Lane C. Sander ◽  
...  
Keyword(s):  
Reference Materials ◽  
Marine Sediment ◽  
Organic Contaminants ◽  
Standard Reference Materials
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