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 asphyxiant		Percutaneous
Prohibited use		Prohibited recirculation
Minimum exposure		Explosion 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.

Reference

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.

Analytical protocol

Principle: Ion chromatography with conductivity detection (IC-CD)
Remarks: The analytical result for the particles collected on filter is expressed as sulfate.

Reference

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