•1. Cylinder identification number (serial number).
•2. Certified concentration
within three digits of the standard (ppm or % -mole basis).
•3. Balance gas in the
standard mixture.
•4. Cylinder pressure at time
of certification.
•5. Assay/Certification date.
•6. Certification expiration date.
•7. Reference standard identification (standard
type [SRM, PRM, NTRM, or GMIS], cylinder number and concentration).
•8. Statement that the assay/certification conforms
to EPA protocol guidelines.
•9. Analytical method used.
•10. Laboratory identification number (laboratory
name, laboratory address).
•11. Chronology of previous EPA protocol gas
certification for this cylinder.
•12. Analytical accuracy of the
mixture.
•13. Statement that
certification was corrected for interference's (if applicable).
•14. Ensure the concentration
certified by the vendor matches the cylinder label value.
Minimum Requirements for U.S. EPA Protocol Gases
The following is the minimum information to
be included when reviewing the certification documentation for U.S. EPA
Protocol gases.