ASTM-E826 2008
$58.50
E826-08 Standard Practice for Testing Homogeneity of a Metal Lot or Batch in Solid Form by Spark Atomic Emission Spectrometry
| Published By | Publication Date | Number of Pages |
| ASTM | 2008 | 27 |
1.1 This practice is suitable for testing the homogeneity of a metal lot or batch (L/B) in solid form by spark atomic emission spectrometry (Spark-AES). It is compliant with ISO Guide 35 Certification of Reference Materials: General and Statistical Principles. It is primarily intended for use in the development of reference materials but may be used in any other application where a L/B is to be tested for homogeneity. It is designed to provide a combined study of within-unit and between-unit homogeneity of such a L/B.
1.2 This practice is designed primarily to test for elemental homogeneity of a metal L/B by Spark-AES. However, it can be adapted for use with other instrumental techniques such as X-ray fluorescence spectrometry (XRF) or atomic absorption spectrometry (AAS).
Note 1This practice is not limited to elemental analysis or techniques. This practice can be applied to any property that can be measured, for example, the property of hardness as measured by the Rockwell technique.
1.3 The criteria for acceptance of the test specimens must be previously determined. That is, the maximum acceptable level of heterogeneity must be determined on the basis of the intended use of the L/B.
1.4 It is assumed that the analyst is trained in Spark-AES techniques including the specimen preparation procedures needed to make specimens ready for measurements. It is further assumed that the analyst is versed in and has access to computer-based data capture and analysis. The methodology of this practice is best utilized in a computer based spreadsheet.
1.5 This practice can be applied to one or more elements in a specimen provided the signal-to-background ratio is not a limiting factor.
1.6 This practice includes methods to correct for systematic drift of the instrument with time. ( Warning If drift occurs, erroneous conclusions will be obtained from the data analysis.)
1.7 This practice also includes methods to refine estimates of composition and uncertainty through the use of a type standard or multiple calibrants.
1.8 It further provides a means of reducing a nonhomogeneous set to a homogeneous subset.
1.9 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 1 | Scope Referenced Documents Terminology |
| 2 | Summary of Practice Significance and Use Summary of the Test Method |
| 3 | Lot or Batch Forms The Sampling Model FIG. 1 |
| 4 | FIG. 2 FIG. 3 |
| 5 | The Test Portion Selection of Test Specimens |
| 6 | Test Procedure TABLE 1 |
| 7 | TABLE 2 |
| 8 | Calculations to Determine Homogeneity Drift Correction by the Interpolation Method |
| 9 | Drift Correction by the Least-Squares, Single Monitor Method TABLE 3 |
| 10 | TABLE 4 |
| 11 | Drift Correction by the Least-Squares, Multiple Monitor Method Compositional Estimate by the Type Standard Method |
| 12 | Compositional Determination by the Multiple Calibrant Method Determination of a Homogeneous Subset |
| 13 | Precision and Bias Keywords X1. EXAMPLE 1 TO ILLUSTRATE THIS PROCEDURE X1.1 Specimen Selection X1.2 Test Procedure A (Drift Monitor) X1.3 Test for Instrumental Drift TABLE X1.1 |
| 14 | X1.4 Test for Homogeneity Utilizing Procedure A TABLE X1.2 TABLE X1.3 |
| 15 | X1.5 Test Procedure B (No Drift Monitor) X1.6 Test for Homogeneity Utilizing Procedure B X2. EXAMPLE 2 TO ILLUSTRATE THIS PROCEDURE X2.1 Explanation of Need for Application of This Practice TABLE X1.4 |
| 16 | X2.2 Specimen Preparation X2.3 Batch Homogeneity Specimen Selection X2.4 Specimen Verification X2.5 Calibrant Selection X2.6 Data Generation TABLE X2.1 |
| 17 | X2.7 Data Processing X2.8 Final Preparation and Shipping X3. EXAMPLE 3 TO ILLUSTRATE THIS PROCEDURE X3.1 Explanation of Need for Application of This Practice TABLE X2.2 |
| 18 | X3.2 Specimen Preparation X3.3 Within-Unit Homogeneity Testing FIG. X3.1 TABLE X3.1 |
| 19 | X3.4 Between-Unit Homogeneity Testing X3.5 Data Processing TABLE X3.2 |
| 20 | X3.6 Generation of Two Homogeneous Subsets TABLE X3.3 TABLE X3.4 |
| 21 | X3.7 Data Reprocessing X3.8 Conversion to Stock TABLE X3.5 TABLE X3.6 |
| 22 | X4. EXAMPLE 4 TO ILLUSTRATE THIS PROCEDURE X4.1 Explanation of Need for Application of This Practice X4.2 Preliminary Lot Processing X4.3 Within-Unit Homogeneity Testing FIG. X4.1 |
| 23 | X4.4 Between-Unit Homogeneity Testing TABLE X4.1 |
| 24 | X4.5 Calibrant Selection X4.6 Data Generation X4.7 Data Processing TABLE X4.2 |
| 25 | X4.8 Depth Homogeneity Study X4.9 Preparation for Interlaboratory Study TABLE X4.3 |
| 26 | TABLE X4.4 TABLE X4.5 |
| 27 | X5. ADDITIONAL INFORMATION CONCERNING THE USE OF TABLE 1 FOR STATISTICAL ANALYSIS OF DATA X5.1 X5.2 REFERENCES TABLE X5.1 |
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