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2017 | OriginalPaper | Buchkapitel

Using Guard Bands to Accommodate Uncertainty in the Spark AES Analysis of Aluminum or Aluminum Alloys When Determining Compliance with Specified Composition Limits

verfasst von : Thomas Belliveau, Denis Choquette, Olivier Gabis, Michael Ruschak, John Sieber, Albert Wills, Rebecca Wyss

Erschienen in: Light Metals 2017

Verlag: Springer International Publishing

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Abstract

Every pound of aluminum or aluminum alloys cast and sold is certified to meet The Aluminum Association Inc. registered limits or other specified composition limits. Certification of aluminum and aluminum alloys to specified composition limits is typically done using Spark-Atomic Emission Spectrometry (Spark-AES) following the procedures in ASTM International (ASTM) E716 Standard Practices for Sampling and Sample Preparation of Aluminum and Aluminum Alloys for Determination of Chemical Composition by Spectrochemical Analysis and ASTM E1251 Standard Test Method for Analysis of Aluminum and Aluminum Alloys by SparkAES. Spark-AES laboratories at major aluminum production facilities normally have excellent analytical practices and follow strict quality control protocols to provide the best results possible. However, every measurement has an associated uncertainty and the measurement of composition using Spark-AES is no exception to the rule. This paper provides a brief discussion of:
1.
The uncertainty inherent in the elemental analysis of aluminum and aluminum alloys by Spark-AES.
 
2.
The benefits of using guard bands to set internal operating limits, which are offset from specified composition limits.
 
3.
A model of the risk for sale of out-of-specification product based on the analysis uncertainty relative to the specified composition limits.
 
4.
The main sources of uncertainty of Spark-AES and their potential causes.
 

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Literatur
1.
Zurück zum Zitat ASTM Standard E716 Standard Practices for Sampling and Sample Preparation of Aluminum and Aluminum Alloys for Determination of Chemical Composition by Spectrochemical Analysis (West Conshohocken, PA; ASTM International, 2016) ASTM Standard E716 Standard Practices for Sampling and Sample Preparation of Aluminum and Aluminum Alloys for Determination of Chemical Composition by Spectrochemical Analysis (West Conshohocken, PA; ASTM International, 2016)
2.
Zurück zum Zitat The Aluminum Association International Designations and Chemical Composition Limits for Unalloyed Aluminum (Arlington, VA: Aluminum Association, 2007) The Aluminum Association International Designations and Chemical Composition Limits for Unalloyed Aluminum (Arlington, VA: Aluminum Association, 2007)
3.
Zurück zum Zitat ISO 3534-1:1993, Statistics—Vocabulary and symbols—Part 1: Probability and general statistical terms (Geneva, Switzerland; International Organization for Standardization, 1993) ISO 3534-1:1993, Statistics—Vocabulary and symbols—Part 1: Probability and general statistical terms (Geneva, Switzerland; International Organization for Standardization, 1993)
4.
Zurück zum Zitat ISO/IEC Guide 99 International Vocabulary of Metrology—Basic and General Concepts and Associated Terms (VIM) (Geneva, Switzerland; International Organization for Standardization, 2007) ISO/IEC Guide 99 International Vocabulary of Metrology—Basic and General Concepts and Associated Terms (VIM) (Geneva, Switzerland; International Organization for Standardization, 2007)
5.
Zurück zum Zitat S.L.R. Ellison, A. Williams (ed.), EURACHEM/CITAC Guide: Use of Uncertainty Information in Compliance Assessment (United Kingdom; EURACHEM, 2007) S.L.R. Ellison, A. Williams (ed.), EURACHEM/CITAC Guide: Use of Uncertainty Information in Compliance Assessment (United Kingdom; EURACHEM, 2007)
Metadaten
Titel
Using Guard Bands to Accommodate Uncertainty in the Spark AES Analysis of Aluminum or Aluminum Alloys When Determining Compliance with Specified Composition Limits
verfasst von
Thomas Belliveau
Denis Choquette
Olivier Gabis
Michael Ruschak
John Sieber
Albert Wills
Rebecca Wyss
Copyright-Jahr
2017
DOI
https://doi.org/10.1007/978-3-319-51541-0_37

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