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August 31, 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.

Sulfur dioxide  

French name in the regulation: Soufre, dioxyde de
CAS : 7446-09-5
Synonyms: Dioxyde de soufre

Exposure Standards in RROHS regulation

Permissible exposure values (PEV)
ppm mg/m3 f/cc Notes
TWAEV 2 5,2 - -
STEV 5 13 - -
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: Sulfur dioxide

Analysis:

Soufre, dioxyde de

Method: IRSST - 8-B

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: Sulfur dioxide is quantified in the field with a direct-reading instrument (DRI). The minimum reported value is 1.3 mg/m³ (0.5 ppm). The reference method corresponds to calibration of the DRI.

IRSST. "Étalonnage d'un instrument à lecture directe du dioxyde de soufre dans l'air". Méthode 8-B. Méthodes d'étalonnage. Montréal: IRSST, 1996.

Soufre, dioxyde de

Recommended method by the IRSST:
Method: OSHA - ID200

Sampling protocol

Sampling device: Impregnated Anasorb 747 tube preceded by a filter #SKC 226-80
Parameters:
Flow rate: 0,1 L/min
TWA sampling volume: 12 L
STEL sampling volume: 1,5 L
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: Ion chromatography with conductivity detection (IC-CD)
Remarks: The analytical result for the particles collected on filter is expressed as sulfate.

OSHA Analytical Methods Manual. Method ID200, Sulfur Dioxide in Workplace Atmospheres, 1992.