Federal regulations · Through 2026-08-25 · Newer source version available

40 CFR Table B-3 to Subpart B of Part 53: Table B-3 to Subpart B of Part 53—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
SO2 Ultraviolet fluorescence 5 0.1 4 0.14 0.5 0.5 0.5 0.2 20,000 6 0.05
SO2 Flame photometric 0.01 4 0.14 750 3 20,000 50
SO2 Gas chromatography 0.1 4 0.14 750 3 20,000 50
SO2 Spectrophotometric-wet chemical (pararosanaline) 0.2 0.1 0.1 4 0.14 0.5 750 0.5
SO2 Electrochemical 0.2 0.1 0.1 4 0.14 0.5 0.5 0.2 0.5 3 20,000
SO2 Conductivity 0.2 0.1 4 0.14 0.5 750
SO2 Spectrophotometric-gas phase, including DOAS 4 0.14 0.5 0.5 0.5 0.2
O3 Ethylene Chemiluminescence 3 0.1 750 4 0.08 3 20,000
O3 NO-chemiluminescence 3 0.1 0.5 750 4 0.08 3 20,000
O3 Electrochemical 3 0.1 0.5 0.5 4 0.08 3 20,000
O3 Spectrophotometric-wet chemical (potassium iodide) 3 0.1 0.5 0.5 3 0.5 4 0.08
O3 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
NO2 Chemiluminescent 3 0.1 0.5 4 0.1 0.5 20,000
NO2 Spectrophotometric-wet chemical (azo-dye reaction) 0.5 4 0.1 0.5 750 0.5
NO2 Electrochemical 0.2 3 0.1 0.5 4 0.1 0.5 750 0.5 20,000 50
NO2 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.

Where this section sits in the code

Title 40—Protection of Environment
CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY
SUBCHAPTER C—AIR PROGRAMS
PART 53—AMBIENT AIR MONITORING REFERENCE AND EQUIVALENT METHODS
Subpart B—Procedures for Testing Performance Characteristics of Automated Methods for SO2, CO, O3, and NO2

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

SO2 Ultraviolet fluorescence 5 0.1 4 0.14 0.5 0.5 0.5 0.2 20,000 6 0.05

SO2 Flame photometric 0.01 4 0.14 750 3 20,000 50

SO2 Gas chromatography 0.1 4 0.14 750 3 20,000 50

SO2 Spectrophotometric-wet chemical (pararosanaline) 0.2 0.1 0.1 4 0.14 0.5 750 0.5

SO2 Electrochemical 0.2 0.1 0.1 4 0.14 0.5 0.5 0.2 0.5 3 20,000

SO2 Conductivity 0.2 0.1 4 0.14 0.5 750

SO2 Spectrophotometric-gas phase, including DOAS 4 0.14 0.5 0.5 0.5 0.2

O3 Ethylene Chemiluminescence 3 0.1 750 4 0.08 3 20,000

O3 NO-chemiluminescence 3 0.1 0.5 750 4 0.08 3 20,000

O3 Electrochemical 3 0.1 0.5 0.5 4 0.08 3 20,000

O3 Spectrophotometric-wet chemical (potassium iodide) 3 0.1 0.5 0.5 3 0.5 4 0.08

O3 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

NO2 Chemiluminescent 3 0.1 0.5 4 0.1 0.5 20,000

NO2 Spectrophotometric-wet chemical (azo-dye reaction) 0.5 4 0.1 0.5 750 0.5

NO2 Electrochemical 0.2 3 0.1 0.5 4 0.1 0.5 750 0.5 20,000 50

NO2 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.

Collected 2026-08-27T02:26:04Z. Source file · JSON

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