EPA Science Inventory

ALT-114 and ALT-118 Alternative Approaches to NIST-Traceable Reference Gases

Citation:

Ryan, J. ALT-114 and ALT-118 Alternative Approaches to NIST-Traceable Reference Gases. Presented at The 41st Stationary Source Sampling and Analysis for Air Pollutants Conference, Tucson, AZ, April 09 - 14, 2017.

Description:

In 2016, US EPA approved two separate alternatives (ALT 114 and ALT 118) for the preparation and certification of Hydrogen Chloride (HCl) and Mercury (Hg) cylinder reference gas standards that can serve as EPA Protocol gases where EPA Protocol are required, but unavailable. The alternatives were necessary due to the unavailability of NIST reference materials (SRM, NTRM, CRM or RGM) or VSL reference materials (VSL PRM or VSL CRM), reference materials identified in EPA’s Green Book as necessary to establish the traceability of EPA protocol gases. ALT 114 and ALT 118 provides a pathway for gas vendors to prepare and certify traceable gas cylinder standards for use in certifying Hg and HCl CEMS. In this presentation, EPA will describe the mechanics and requirements of the performance-based approach, provide an update on the availability of these gas standards and also discuss the potential for producing and certifying gas standards for other compounds using this approach.

Purpose/Objective:

This presentation discusses the importance of NIST-traceable reference gases relative to regulatory source compliance emissions monitoring. Specifically this presentation discusses 2 new approaches for making necessary reference gases available in the absence of NIST reference materials. Moreover, these approaches provide an alternative approach to rapidly make available new reference gases for additional HAPS regulatory compliance emissions measurement and monitoring.

URLs/Downloads:

RYAN SES 2017 ALT-114-118.PDF   (PDF,NA pp, 1337.469 KB,  about PDF)

Record Details:

Record Type: DOCUMENT (PRESENTATION/SLIDE)
Start Date: 04/14/2017
Completion Date: 04/14/2017
Record Last Revised: 04/29/2017
Record Created: 04/27/2017
Record Released: 04/27/2017
OMB Category: Other
Record ID: 336073

Organization:

U.S. ENVIRONMENTAL PROTECTION AGENCY

OFFICE OF RESEARCH AND DEVELOPMENT

NATIONAL RISK MANAGEMENT RESEARCH LABORATORY

AIR POLLUTION PREVENTION AND CONTROL DIVISION

AIR POLLUTION TECHNOLOGY BRANCH