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OHS Research
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Loan, Calibration and Repairs
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Interlaboratory quality
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substance
September 10, 2025
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/m
3
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.
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