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

Mercury [7439-97-6], mecury vapor (as Hg)

French name in the regulation: Mercure [7439-97-6], vapeur de mercure
CAS : 7439-97-6

Exposure Standards in RROHS regulation

Permissible exposure values (PEV)
ppm mg/m3 f/cc Notes
TWAEV - 0,025 - -
STEV - - - -
Ceiling - - - -
Simple asphyxiant Percutaneous
Minimum exposure Sensitizer
Prohibited use Prohibited recirculation

TWA adjustment for unusual work schedules

III : Weekly adjustment

CNESST – Toxicological Index Service


Mercure sur tube

Recommended method by the IRSST:
Method: NIOSH - 6009
Sampling device: Anasorb C300 or Hopcalite tube
Flow rate: 0,15-0,25 L/min
TWA sampling volume: 100 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. Please contact the IRSST before sampling.
Principle: Cold vapour atomic absorption spectrophotometry (CV-AAS)
Remarks: Sampling on passive dosimeter is possible with a higher minimum reported value.
NIOSH Manual of Analytical Methods, 4th ed., Method 6009 : Mercury. Cincinnati, NIOSH, 1994.

Mercure avec ILD

Method: IRSST - 2-A
Sampling device:
Flow rate: -
TWA sampling volume: -
STEL sampling volume: -
Principle: Direct reading instrument-Amalgamation (DRI-Am)
Remarks: Refer to the user's guide that accompanies the instrument. The minimum reported value is 0.5µg/m³. The reference method corresponds to the calibration of the direct-reading instrument (DRI).
IRSST. "Étalonnage d'un instrument à lecture directe pour la mesure du mercure dans l'air" (méthode statique). Méthode 2-A. Méthodes d'étalonnage. Non publiée.
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.