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EPA/OAR RIN: 2060-AT09 Publication ID: Fall 2022 
Title: Revision to Method 23--Determination of Polychlorinated Dibenzo-P-Dioxins and Polychlorinated Dibenzofurans From Stationary Sources 

This action finalizes revisions to 40 CFR part 60, appendix A, method 23, 'Determination of Polychlorinated Dibenzo-P-Dioxins and Polychlorinated Dibenzofurans from Stationary Sources,' which was last revised on March 31, 1995 (60 FR 28378). This update to method 23 is a complete republication of the method to determine polychlorinated dibenzo-p-dioxins (PCDDs) and dibenzofurans (PCDFs) which will now include an option to determine polycyclic aromatic hydrocarbons (PAHs), and/or polychlorinated biphenyls (PCBs). This update revises the analytical procedure to include isotope dilution mass spectrometry combined with high resolution gas chromatography, which is consistent with industry practice. The update moves the method from a prescriptive to a performance-based methodology and removes requirements in the method to use outdated standards or materials. This provides industry with an appropriate method in the execution of method 23, which has shown wide variation in its implementation, and will allow many performance-based options and procedures.

Agency: Environmental Protection Agency(EPA)  Priority: Substantive, Nonsignificant 
RIN Status: Previously published in the Unified Agenda Agenda Stage of Rulemaking: Final Rule Stage 
Major: No  Unfunded Mandates: No 
CFR Citation: 40 CFR 60 JJJ   
Legal Authority: 42 U.S.C. 7401 et seq. Clean Air Act   
Legal Deadline:  None
Action Date FR Cite
NPRM  01/14/2020  85 FR 2234   
Final Rule  01/00/2023 
Additional Information: .
Regulatory Flexibility Analysis Required: No  Government Levels Affected: None 
Small Entities Affected: No  Federalism: No 
Energy Effects: Statement of Energy Effects planned as required by Executive Order 13211.  Included in the Regulatory Plan: No 
RIN Data Printed in the FR: No 
Agency Contact:
Ned Shappley
Environmental Protection Agency
Office of Air and Radiation
109 T.W. Alexander Drive, Mail Code E143-02,
Research Triangle Park, NC 27709
Phone:919 541-7903