2,4-D (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.

2,4-D (Pi)

French name in the regulation: 2,4-D (Pi)

CAS : 94-75-7

Synonyms: Acide dichloro-2,4 phénoxyacétique

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

III : Weekly adjustment

CNESST – Toxicological Index Service

Consult REPTOX file: 2,4-D(Pi)

Analysis:

2-4,D

Recommended method by the IRSST:

Method: NIOSH - 5001

Sampling protocol

Sampling device: Glass fiber filter, binderless
Parameters:
Flow rate: 1-3 L/min
TWA sampling volume: 200 L
STEL sampling volume: -
Remarks: The aerosol phase might be underestimated because the efficiency of the sampling device does not match inhalable fraction definition. For more information, please contact the IRSST. This substance is not analyzed by our laboratories. It might be possible that the analysis is performed by another laboratory. Please contact the IRSST before sampling.

Analytical protocol

Principle: High performance liquid chromatography with UV detection (HPLC-UV)

Reference

NIOSH Manual of Analytical Methods. 4th ed. Method 5001 : 2,4-D And 2,4,5-T. 1994.