Hard metals containing cobalt and tungsten carbide (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.

Hard metals containing cobalt and tungsten carbide (Pthor)

French name in the regulation: Métaux durs contenant du cobalt et du carbure de tungstène (Pthor)

Exposure Standards in RROHS regulation

Permissible exposure values (PEV)

	ppm	mg/m³	f/cc	Notes
TWAEV	-	0,005	-	Pthor
STEV	-	-	-	-
Ceiling	-	-	-	-

Carcinogenicity	C2	Sensitizer	R
Simple asphyxiant		Percutaneous
Prohibited use		Prohibited recirculation
Minimum exposure		Explosion hazard
Ototoxic

TWA adjustment for unusual work schedules

Undetermined

CNESST – Toxicological Index Service

Consult REPTOX file:

Analysis:

Hard metals containing cobalt and tungsten carbide (as CO)

Recommended method by the IRSST:

Method: OSHA - ID213

Sampling protocol

Sampling device: Cassette 3-part, MCE filter, 37 mm, 0.8 µm
Parameters:
Flow rate: 1,6 (GK2,69) L/min
TWA sampling volume: 480 L
STEL sampling volume: -
Remarks: A cyclone is required for sampling. The cassette to be used is directly related to the type of cyclone used. The GK2,69 cyclone model must be used with a 3 sections cassette. 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: Inductively coupled plasma-optical emission spectrometer (ICP-OES)
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 cobalt, thoracic fraction.

Reference

OSHA Chemical information Manual, ID-213, Tungsten and cobalt in workplace atmospheres (ICP analysis), 1994.