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:
The uncertainty inherent in the elemental analysis of aluminum and aluminum alloys by Spark-AES.
The benefits of using guard bands to set internal operating limits, which are offset from specified composition limits.
A model of the risk for sale of out-of-specification product based on the analysis uncertainty relative to the specified composition limits.
The main sources of uncertainty of Spark-AES and their potential causes.