Interferent Test Concentration, 1 Parts per Million

Table B-3 to Subpart B of Part 53—Interferent Test Concentration 1 [Parts per million] Pollutant Analyzer type 2 Hydro-chloric acid Ammonia Hydrogen sulfide Sulfur dioxide Nitrogen dioxide Nitric oxide Carbon dioxide Ethylene Ozone M-xylene Water vapor Carbon monoxide Methane Ethane Naphthalene SO 2 Ultraviolet fluorescence 5 0.1 4 0.14 0.5 0.5 0.5 0.2 20,000 6 0.05 SO 2 Flame photometric 0.01 4 0.14 750 3 20,000 50 SO 2 Gas chromatography 0.1 4 0.14 750 3 20,000 50 SO 2 Spectrophotometric-wet chemical (pararosanaline) 0.2 0.1 0.1 4 0.14 0.5 750 0.5 SO 2 Electrochemical 0.2 0.1 0.1 4 0.14 0.5 0.5 0.2 0.5 3 20,000 SO 2 Conductivity 0.2 0.1 4 0.14 0.5 750 SO 2 Spectrophotometric-gas phase, including DOAS 4 0.14 0.5 0.5 0.5 0.2 O 3 Ethylene Chemiluminescence 3 0.1 750 4 0.08 3 20,000 O 3 NO-chemiluminescence 3 0.1 0.5 750 4 0.08 3 20,000 O 3 Electrochemical 3 0.1 0.5 0.5 4 0.08 3 20,000 O 3 Spectrophotometric-wet chemical (potassium iodide) 3 0.1 0.5 0.5 3 0.5 4 0.08 O 3 Spectrophotometric-gas phase, including ultraviolet absorption and DOAS 0.5 0.5 3 0.5 4 0.08 0.02 20,000 CO Non-dispersive Infrared 750 20,000 4 10 CO Gas chromatography with flame ionization detector 20,000 4 10 0.5 CO Electrochemical 0.5 0.2 20,000 4 10 CO Catalytic combustion-thermal detection 0.1 750 0.2 20,000 4 10 5.0 0.5 CO IR fluorescence 750 20,000 4 10 0.5 CO Mercury replacement-UV photometric 0.2 4 10 0.5 NO 2 Chemiluminescent 3 0.1 0.5 4 0.1 0.5 20,000 NO 2 Spectrophotometric-wet chemical (azo-dye reaction) 0.5 4 0.1 0.5 750 0.5 NO 2 Electrochemical 0.2 3 0.1 0.5 4 0.1 0.5 750 0.5 20,000 50 NO 2 Spectrophotometric-gas phase 3 0.1 0.5 4 0.1 0.5 0.5 20,000 50 1 Concentrations of interferent listed must be prepared and controlled to ±10 percent of the stated value. 2 Analyzer types not listed will be considered by the Administrator as special cases. 3 Do not mix interferent with the pollutant. 4 Concentration of pollutant used for test. These pollutant concentrations must be prepared to ±10 percent of the stated value. 5 If candidate method utilizes an elevated-temperature scrubber for removal of aromatic hydrocarbons, perform this interference test. 6 If naphthalene test concentration cannot be accurately quantified, remove the scrubber, use a test concentration that causes a full-scale response, reattach the scrubber, and evaluate response for interference. [89 FR 16383, Mar. 6, 2024]