Sulfuric acid (Pthor)

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.

Sulfuric acid (Pthor)

French name in the regulation: Acide sulfurique (Pthor)

CAS : 7664-93-9

Exposure Standards in RROHS regulation

Permissible exposure values (PEV)

	ppm	mg/m³	f/cc	Notes
TWAEV	-	0,2	-	Pthor
STEV	-	-	-	-
Ceiling	-	-	-	-

Carcinogenicity	C2	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: Sulfuric acid(Pthor)

Analysis:

Sulfuric acid

Method: IRSST - 414

Sampling protocol

Sampling device:
Sampling media required:

#IRSST	Description
944	PPI cassette with quartz filter and vial

Parameters:
Flow rate: 2 L/min
TWA sampling volume: 420 L
STEL sampling volume: -
Remarks: The cassette consists of a 37 mm quartz fibers filter that will collect the acids in particulate form and mists. The samples are stable for 7 days at 25°C and 28 days at 4°C. The recommended method needs a minimum of 3 field blanks.

Analytical protocol

Principle: Ion chromatography with conductivity detection (IC-CD)
Precision (%): 2,5
Minimum reported value: 5 µg
Remarks: All the sulfate ions not originating from the acid can cause a positive interference. Analytical results are expressed as sulfuric acid.

Reference

IRSST. "Détermination des acides inorganiques non-volatils (H2SO4 et H3PO4) par chromatographie ionique". Méthode 414. Publiée.