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November 21, 2024

According to Decree 280-2024 published on February 28, 2024, in the Gazette officielle du Québec, the amendment to the Appendix 1 of the Regulation respecting occupational health and safety (RSST, RLRQ, c. S-2.1, r. 13) will come into force on March 14, 2024. These regulatory changes have not yet been incorporated into the current Substance Data Sheets of the Sampling Guide for Air Contaminants in the Workplace. An update is currently underway and will be available as soon as possible. Consequently, the information contained in the data sheets of substances modified or added in Decree 280-2024 is partially inaccurate or incomplete. Please consult our infoLABO (in French only) for more details. Please contact our client service: [email protected] for further information.

Ammonia  

French name in the regulation: Ammoniac
CAS : 7664-41-7

Exposure Standards in RROHS regulation

Permissible exposure values (PEV)
ppm mg/m3 f/cc Notes
TWAEV 25 17 - -
STEV 35 24 - -
Ceiling - - - -
Carcinogenicity Sensitizer
Simple asphyxiantPercutaneous
Prohibited useProhibited recirculation
Minimum exposureExplosion hazard
Ototoxic

TWA adjustment for unusual work schedules

1B : No adjustment

CNESST – Toxicological Index Service

Consult REPTOX file: Ammonia

Analysis:

Ammoniac

Method: IRSST - 49

Sampling protocol

Sampling device:
Parameters:
Flow rate: -
TWA sampling volume: -
STEL sampling volume: -
Remarks: Refer to the user's guide accompanying the instrument.

Principle: Direct reading instrument-Electrochemical cell (DRI-elec)
Remarks: Ammonia is quantified in the field with a direct-reading instrument (DRI). The minimum reported value is 2.1 mg/m³ (3 ppm). The reference method corresponds to calibration of the DRI.

IRSST. "Méthode d'étalonnage d'un instrument à lecture directe". Méthode 49. Non publiée.

Ammoniac

Method: IRSST - 220-1

Sampling protocol

Sampling device:
Sampling media required:
#IRSSTDescription
2144 Tube of carbon pretreated with sulfuric acid 500/250 mg

Parameters:
Flow rate: 0,10 - 0,5 L/min
TWA sampling volume: 24 L
STEL sampling volume: 7,5 L
Remarks: These tubes have a limited shelf life. It is important to respect the expiration date printed on the package.

Principle: Ion chromatography with conductivity detection (IC-CD)
Precision (%): 4,04
Minimum reported value: 9,4 µg
Remarks: The ammonium ion (NH4+) is being analyzed, so all ammonium salts and some substituted ammoniums will cause interference. The analytical results are expressed as ammonia (NH3).

IRSST. "Analyse de l'ammoniac dans l'air". Méthode 220-1. Non publiée.