Scott-Marrin was one of the first companies in the United States to make EPA Protocol gases commercially available for environmental monitoring purposes.  Since the mid 1970's, Scott-Marrin was manufacturing low-level mixtures in nitrogen and UltraPure Air packaged exclusively in aluminum cylinders.  EPA Protocol gas mixtures resulted in an excellent fit for our current area of expertise.

EPA Protocol mixtures are analyzed in accordance with "EPA Traceability Protocol for Assay and Certification of Gaseous Calibration Standards" document number EPA-600/R97/121 revised September 1997.  All mixtures are traceable to the National Institute of Standards and Technology (NIST) gaseous Standard Reference Materials (SRM) using EPA procedures, and meet or exceed the appropriate EPA Protocol specifications for accuracy.

A Certificate of Analysis is provided with each mixture.  The COA contains the replicate analysis data, the NIST traceable reference standard and the analytical instrument used in the analysis.

Below is a listing of individual components and their EPA ranges.  If you do not see your requirements listed below, give us a call for assistance.
 

Single Component EPA Protocol ranges
 

COMPONENT NAME	EPA  RANGE	BALANCE
CARBON DIOXIDE	2500 ppm - 30 mole-%	AIR OR NITROGEN
CARBON MONOXIDE	5 ppm - 10 mole-%	AIR OR NITROGEN
HYDROGEN SULFIDE	10 ppm - 40 ppm	AIR OR NITROGEN
METHANE	2 ppm - 20 ppm	AIR OR NITROGEN
NITRIC OXIDE	2.5 ppm - 5000 ppm	O2 FREE NITROGEN
OXYGEN	0.5 mole-% - 25 mole-%	NITROGEN
PROPANE	3 ppm - 9990 ppm	AIR OR NITROGEN
SULFUR DIOXIDE	13 ppm - 5000 ppm	AIR OR NITROGEN

Multi-Component EPA Protocol ranges
 

NON-REACTIVE:
COMPONENT NAME	TYPICAL RANGE	BALANCE
CARBON DIOXIDE	2500 ppm - 30 mole-%	AIR OR NITROGEN
CARBON MONOXIDE	5 ppm - 10 mole-%	AIR OR NITROGEN
METHANE	2 ppm - 20 ppm	AIR OR NITROGEN
OXYGEN	0.5 ppm - 25 mole-%	NITROGEN
PROPANE	3 ppm - 9990 ppm	AIR OR NITROGEN
REACTIVE:
COMPONENT NAME	TYPICAL RANGE	BALANCE
NITRIC OXIDE	2.5 ppm - 5000 ppm	O2 FREE NITROGEN
SULFUR DIOXIDE	13 ppm - 5000 ppm	AIR OR NITROGEN