United States                    Air and Energy Engineering
                Environmental Protection             Research Laboratory
                Agency	Research Triangle Park NC 27711

                Research and Development           EPA/600/S8-90/053 Sep. 1990
&EPA        Project Summary
                 Recommended Operating
                 Procedure No.  45: Analysis  of
                 Nitrous  Oxide from Combustion
                 Sources
                 Judith S. Ford
                  This recommended operating pro-
                cedure (ROP) has been prepared for
                use in research activities conducted
                by EPA's Air and Energy Engineering
                Research Laboratory (AEERL). The
                procedure applies to the measure-
                ment  of nitrous  oxide  (N2O) in  dry
                gas samples extracted from gas
                streams where N2O  concentrations
                range from 0.5 to 200 parts per million
                (ppm). N2O concentrations are inter-
                preted by an electron capture detec-
                tor (ECD). The  ECD uses a  63Ni
                constant  current cell. The upper
                limits of this procedure can be exten-
                ded by changing the sample loop
                pressure to reduce  the volume of
                sample in the loop or by diluting the
                sample.
                  ROPs describe non-routine or
                experimental research  operations
                where some judgment in application
                may be warranted. ROPs may not be
                applicable to activities conducted by
                other reserach groups and should
                not be used in  place  of standard
                operating procedures. Use  of ROPs
                must  be accompanied by an under-
                standing of their purpose and scope.
                   This  Project  Summary  was
                developed by EPA's Air and Energy
                Engineering Research Laboratory,
                Research  Triangle Park, NC, to
                announce key findings of the research
                project that is fully documented in a
                separate report of the same title (see
                Project Report ordering information at
                back).

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   Judith S. Ford is the EPA Project Officer (see below).
   The complete report,  entitled  "Recommended Operating  Procedure No. 45:
        Analysis of Nitrous Oxide from Combustion Sources," (Order No. PB 90-
        238 502/AS; Cost: $15.00, subject to change) will be available only from:
            National Technical Information Service
            5285 Port Royal Road
            Springfield, VA 22161
            Telephone: 703-487-4650
   The EPA Project Officer can be contacted at:
            Air and Energy Engineering Research Laboratory
            U.S. Environmental Protection Agency
            Research Triangle Park, NC 27711
United States                   Center for Environmental Research
Environmental Protection         Information
Agency                         Cincinnati OH 45268
Official Business
Penalty for Private Use $300

EPA/600/S8-90/053

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