All AAS Standards are produced in accordance with ISO 17034 and characterized in accordance with ISO/IEC 17025. Certified values and related uncertainties are obtained on the basis of two independent testing methods whenever it is possible. Direct traceability to NIST/BAM.
Modifiers are produced by CPAchem using high-purity metals or salts in sub-boiling distilled acids.
CPAchem's quality system is currently ISO 9001 certified.