Abstract
Rio Tinto Alcan (RTA) produces Value-Added Aluminium Products (VAP) with very tight chemical composition specifications for addition ingredients and trace elements in order to meet the final product requirements for the client. The control and the certification of the alloy chemical composition rely on the utilization of the spark atomic emission spectrometry (Spark-AES) or commonly named Optical Emission Spectroscopy (OES). This technique, used by the cast house operation personnel, must be calibrated using a combination of appropriate spectroscopic Certified Reference Materials (CRM) with very tight chemical composition which are referenced to wet chemical analysis methods. This paper presents the production and certification process applied by RTA at Arvida Research and Development Center to certify the composition of CRMs. The analytical procedures and methods from classical wet chemistry to modern instrumental techniques are used to produce global and individual certificate of analysis for every CRM disc.
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