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IRSST - Institut de recherche Robert-Sauvé en santé et en sécurité du travail
OHS Research
Research at the IRSST
Reference Framework
Scientists Directory
Publications and Tools
IRSST's Production
Magazine and Newsletter
Scientific Watch
Documentation Center
Useful Links
Laboratory Services
Laboratories
Analysis and Testing Services
Laboratory Methods
Masks Efficacy Evaluation
Workplace Air Contaminants
Slip Resistance Test for Protective Footwear
Loan, Calibration and Repairs
Recognition Programs
CQ Fibres
Quality Control of Fiber Counts
CQ Vrac
Recognized Laboratories
Interlaboratory quality
control program
Guides and Tools
Instruments and Sampling Material
Register
Research Fund and Partnerships
Research Fund and Partnerships
Grants
Scholarships
Master’s Scholarship and Supplement
Doctoral Scholarship and Supplement
Postdoctoral Fellowship
Research partnerships
Institute
About
Activity Report
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substance
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substance
August 28, 2025
o-Tolidine
French name in the regulation:
o-Tolidine
CAS :
119-93-7
Exposure Standards in RROHS regulation
Permissible exposure values (PEV)
ppm
mg/m
3
f/cc
Notes
TWAEV
-
-
-
-
STEV
-
-
-
-
Ceiling
-
-
-
-
Carcinogenicity
C2
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:
o-Tolidine
Analysis:
o-Tolidine
Recommended method by the IRSST:
Method: OSHA - 71
Sampling protocol
Sampling device:
Two glass fiber filters impregnated with sulfuric acid
Parameters:
Flow rate: 1 L/min
TWA sampling volume: 100 L
STEL sampling volume: -
Remarks:
The filters must be transferred to vials containing deionized water within 10 hours of sampling. Contact the IRSST before sampling.
Analytical protocol
Principle:
Gas chromatography with electron-capture detection (GC-ECD)
Remarks:
Any compound that reacts with the sulfuric acid on the filters may cause interferences.
Reference
OSHA, Analytical Methods Manual, Method 71: o-Dianisidine, 4,4'-Methylenebis (2-Chloroaniline) (MOCA), o-Tolidine, 1989.
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