Magnesium oxide (Pi)

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.

Magnesium oxide (Pi)

French name in the regulation: Magnésium, oxyde de (Pi)

CAS : 1309-48-4

Exposure Standards in RROHS regulation

Permissible exposure values (PEV)

	ppm	mg/m³	f/cc	Notes
TWAEV	-	10	-	Pi
STEV	-	-	-	-
Ceiling	-	-	-	-

Carcinogenicity		Sensitizer
Simple asphyxiant		Percutaneous
Prohibited use		Prohibited recirculation
Minimum exposure		Explosion hazard
Ototoxic

TWA adjustment for unusual work schedules

II : Daily adjustment

CNESST – Toxicological Index Service

Consult REPTOX file: Magnesium oxide(Pi)

Analysis:

Magnesium (inhalable dust) (as Mg)

Method: IRSST - 418

Sampling protocol

Sampling device:
Sampling media required:

#IRSST	Description
948	Cassette and MCE filter, 25 mm, 5 µm, disposable inhalable (DIS)

Parameters:
Flow rate: 2 L/min
TWA sampling volume: 240 L
STEL sampling volume: -
Remarks: A surface wipe sampling is available. For more information, please contact the IRSST.

Analytical protocol

Principle: Inductively coupled plasma spectrometry (ICP-MS)
Precision (%): 2,5
Minimum reported value: 20 µg
Remarks: This method allows the analysis of chemical elements present in the sample without distinguishing the different chemical forms. The analytical results are expressed as magnesium, inhalable fraction.

Reference

IRSST. "Détermination par ICP-MS des métaux dans la fraction inhalable de l'air des lieux de travail prélevé sur un dispositif de type IOM jetable : DIS (Disposable Inhalable Sampler)". Méthode MA-418. Non publié.