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

Hydrogen chloride

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

Exposure Standards in RROHS regulation

Permissible exposure values (PEV)
ppm mg/m3 f/cc Notes
TWAEV - - - -
STEV - - - -
Ceiling 2 3* - -
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: -
STEL sampling volume: 30 L
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
Following the amendment of Appendix 1 of the Quebec Regulation respecting occupational health and safety (RSST, RLRQ, c. S-2.1, r. 13), part of Quebec Occupational Health and Safety Act, which came into effect on March 26, 2020, the TWAEV, STEL and Ceiling values for certain substances are now expressed in ppm. For these substances, the IRSST performed the conversion calculations to express these TWAEV, TWA and Ceiling values in mg/m3, which thus appears in its Sampling Guide for Air Contaminants in the Workplace (Guide d'échantillonnage des contaminants de l'air en milieu de travail ) and the associated Substance Data Sheets. However, it is imperative to refer to the values expressed in the RSST which are legally binding.