IRSST - Institut de recherche Robert-Sauvé en santé et en sécurité du travail

On March 26, 2020, according to Decree 159-2020 published on March 11, 2020 in the Gazette officielle du Québec, the Regulation respecting occupational health and safety (RSST, RLRQ, c. S-2.1, r. 13) is amended in Appendix 1. 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 159-2020 is probably inaccurate or incomplete. Please contact our client service: [email protected] for further information.

Hydrogen chloride

French name in the regulation: Chlorure d'hydrogène
CAS : 7647-01-0
Synonyms: Hydrochloric acid, Muriatic acid

Exposure Standards in RROHS regulation

Permissible exposure values (PEV)
ppm mg/m3 f/cc Notes
TWAEV - - - -
STEV - - - -
Ceiling 5 7,5 - -
Simple asphyxiant Percutaneous
Minimum exposure Sensitizer
Prohibited use Prohibited recirculation

TWA adjustment for unusual work schedules

1A : No adjustment

CNESST – Toxicological Index Service

Consult REPTOX file: Hydrogen chloride


Chlorure d'hydrogène

Recommended method by the IRSST:
Method: NIOSH - 7907
Sampling device: Impregnated quartz fiber filter and Quartz fibers prefilter
Flow rate: 2 L/min
TWA sampling volume: 600 L
STEL sampling volume: -
Remarks: This substance is not analyzed by our laboratories. It might be possible that the analysis be performed by another laboratory. The recommended method needs a minimum of 3 field blanks.
Principle: Ion chromatography with conductivity detection (IC-CD)
Remarks: Three ions can be determined simultaneously, namely bromide, chloride and nitrate. Analytical results are expressed as chlorhydric acid.
NIOSH Manual of Analytical Methods, 5th ed., Method 7907 : Volatile acids by Ion Chromatography, NIOSH, 2014