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Technical White Paper on Quantometer Accuracy

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

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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