NBS/EPA (National Bureau of Standards/Environmental Protection Agency) Certified Reference Material Performance Audit Program: Status Report 1

摘要

A traceability procedure has been established which allows specialty gas producers to prepare gaseous pollutant Certified Reference Materials (CRMs). The accuracy, stability and homogeneity of the CRMs approach those of NBS Standard Reference Materials (SRMs). Part of this procedure is an independent quality assurance audit of each CRM batch by an EPA-coordinated auditor. As of August 1984, 33 candidate batches had been audited. In general, the agreement between the producer's analytical results and the audit results has been within plus or minus 0.5 percent relative. Additional data suggest that CRMs are stable during their two-year certification periods.