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

 Important Notice Concerning COVID-19

Due to the rapid spread of COVID-19, and to ensure the health and safety of its employees and its entire network, the IRSST has implemented exceptional measures.
Learn More 

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.

Barium, soluble compounds (as Ba)

French name in the regulation: Baryum, composés solubles
CAS : 7440-39-3

Exposure Standards in RROHS regulation

Permissible exposure values (PEV)
ppm mg/m3 f/cc Notes
TWAEV - 0,5 - -
STEV - - - -
Ceiling - - - -
Simple asphyxiant Percutaneous
Minimum exposure Sensitizer
Prohibited use Prohibited recirculation

TWA adjustment for unusual work schedules

II : Daily adjustment

CNESST – Toxicological Index Service

Consult REPTOX file: Barium, soluble compounds (as Ba)


Baryum, composés solubles (exprimé en Ba)

Method: IRSST - 374
Sampling device:
Sampling media required:
903 PVC filter, 37 mm, 5 µm

Flow rate: 1,5 L/min
TWA sampling volume: 180 L
STEL sampling volume: -
Remarks: Specific sampling must be carried out for this substance.
Principle: Inductively coupled plasma spectrometry (ICP-MS)
Minimum reported value 5 µg
Remarks: This method allow to analyze the chemical element present in the sample without distinguish its chemical form. The analytical results are expressed as total soluble barium.
IRSST. "Détermination des composés solubles dans l'air par ICP-MS". Méthode 374. Non publiée.