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November 24, 2024

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.

Naphthalene  

French name in the regulation: Naphtalène
CAS : 91-20-3

Exposure Standards in RROHS regulation

Permissible exposure values (PEV)
ppm mg/m3 f/cc Notes
TWAEV 10 52* - -
STEV - - - -
Ceiling - - - -
Carcinogenicity C3 Sensitizer
Simple asphyxiantPercutaneous
Prohibited useProhibited recirculation
Minimum exposureExplosion hazard
Ototoxic

TWA adjustment for unusual work schedules

1B : No adjustment

CNESST – Toxicological Index Service

Consult REPTOX file: Naphthalene

Analysis:

Naphtalène

Method: IRSST - 09-1

Sampling protocol

Sampling device:
Sampling media required:
#IRSSTDescription
2120 Activated charcoal tube 100/50 mg

Parameters:
Flow rate: Max: 1,0 L/min
TWA sampling volume: 200 L
STEL sampling volume: -
Remarks: Naphthalene must be specifically sampled due to the specific analysis performed.

Principle: Gas chromatography with flame ionization detection (GC-FID)
Precision (%): 5,0
Minimum reported value: 500 µg

IRSST. "Analyse du naphtalène dans l'air". Méthode 09-1. Non publié.

Naphtalene

Method: IRSST - 225

Sampling protocol

Sampling device:
Sampling media required:
#IRSSTDescription
2187 Orbo 42L tube 100/50 mg

Parameters:
Flow rate: 2 L/min
TWA sampling volume: 960 L
STEL sampling volume: -
Remarks: The sampling train consists of a cassette that will collect the PAHs in particulate form, followed by the sampling tube that will adsorb the PAHs in vapour form. This tube is connected directly to the pump by Tygon tubing. After sampling, the samples must be stored in the freezer protected from light. The tubes and filters must be shipped together and identified to match respectively. 21 PAHs are determined simultaneously. See the info-labos 2008-14 and 2014-02. The prescribed method for the specific evaluation of the naphtalene is the IRSST #09.

Principle: Gas chromatography with mass spectrometry (GC-MS)
Minimum reported value: 0,1 µg
Remarks: CVa for cassette and tube analysis are respectively 4.3% and 1.4%.

IRSST. "Analyse des hydrocarbures polycycliques aromatiques (HPA) dans l'air". Méthode 225. Non publiée.

Naphtalene

Method: IRSST - 225

Sampling protocol

Sampling device:
Sampling media required:
#IRSSTDescription
911 GF filter, 37 mm, 0.8µm

Parameters:
Flow rate: 2 L/min
TWA sampling volume: 960 L
STEL sampling volume: -
Remarks: The sampling train consists of a cassette that will collect the PAHs in particulate form, followed by the sampling tube that will adsorb the PAHs in vapour form. This tube is connected directly to the pump by Tygon tubing. After sampling, the samples must be stored in the freezer protected from light. The tubes and filters must be shipped together and identified to match respectively. 21 PAHs are determined simultaneously. See the info-labos 2008-14 and 2014-02. The prescribed method for the specific evaluation of the naphtalene is the IRSST #09.

Principle: Gas chromatography with mass spectrometry (GC-MS)
Minimum reported value: 0,1 µg
Remarks: CVa for cassette and tube analysis are respectively 4.3% and 1.4%.

IRSST. "Analyse des hydrocarbures polycycliques aromatiques (HPA) dans l'air". Méthode 225. Non publiée.
Following the amendment of Appendix 1 of the Quebec Regulation respecting occupational health and safety (RSST, RLRQ, c. S-2.1, r. 13), part of Quebec Occupational Health and Safety Act, which came into effect on March 26, 2020, the TWAEV, STEL and Ceiling values for certain substances are now expressed in ppm. For these substances, the IRSST performed the conversion calculations to express these TWAEV, TWA and Ceiling values in mg/m3, which thus appears in its Sampling Guide for Air Contaminants in the Workplace (Guide d'échantillonnage des contaminants de l'air en milieu de travail ) and the associated Substance Data Sheets. However, it is imperative to refer to the values expressed in the RSST which are legally binding.