Update on Mercury Emission Measurement Reference Methods, Gas Standards and Traceability Protocols Scott Hedges USEPA, CAMD CAIR/CAMR Implementation Workshop EPA Region V Chicago, Illinois June 7, 2007. Background.
Update on Mercury Emission Measurement Reference Methods, Gas Standards and Traceability ProtocolsScott HedgesUSEPA, CAMDCAIR/CAMR Implementation WorkshopEPA Region V Chicago, IllinoisJune 7, 2007
EPA is preparing a rule package for both the instrumental and sorbent-based reference methods
- Pre-proposal drafts of these methods are tentatively planned to be posted in about a week to the above website with links to the CAMD website
- generate the gas standards used in the field by industry
- calibrate instrumentation to establish the concentrations of the field gases sold
- To qualify for certification, the output of a candidate generator must be repeatable
- Qualification tests designed to demonstrate that the candidate generator output is repeatable over an appropriate range for each variable likely to change between the time and place of certification and its subsequent use
- Focus is given to variables that may impact performance in the field
EPA is working on an alternate procedure to allow field certification of candidate generators at three specific concentrations by direct nose-to-nose comparison with the identical concentrations from a vendor-prime generator. The same combined (extended) uncertainty acceptance criterion that is applicable for the six-concentration approach will also apply to the three-concentration approach.
- in evaluating the field performance of gas generators, and
- as stand alone gas standards
To date EPA:
To date NIST: