Immediately Dangerous to Life or Health Concentrations (IDLH)
CAS number: 87–86–5
NIOSH REL: 0.5 mg/m3 TWA [skin]
Current OSHA PEL: 0.5 mg/m3 TWA [skin]
1989 OSHA PEL: Same as current PEL
1993-1994 ACGIH TLV: 0.5 mg/m3 TWA [skin]
Description of substance: Colorless to white, crystalline solid with a benzene-like odor.
LEL: . . Noncombustible Solid
Original (SCP) IDLH: 150 mg/m3
Basis for original (SCP) IDLH: No useful data on acute inhalation toxicity are available on which to base the IDLH for pentachlorophenol. AIHA  stated that the atmospheric concentration immediately hazardous to life is not known for humans, but painful irritation to the nose is observed at concentrations below those that would be immediately hazardous to life. The chosen IDLH, therefore, has been estimated from the smallest lethal intravenous dose in rabbits of 22 mg/kg [Kehoe et al. 1939 as cited by ACGIH 1971]. According to AIHA , the cause of death from an acute overdose is hyperexia and cardiac failure [Patty 1963].
Short-term exposure guidelines: None developed
ACUTE TOXICITY DATA:
Lethal concentration data:
|Species||Reference||LC50||LCLo||Time||Adjusted 0.5-hrLC (CF)||Derived value|
|Rat||Demidenko 1969||355 mg/m3||—–||?||?||?|
|Mouse||Demidenko 1969||225 mg/m3||—–||?||?||?|
Lethal dose data:
|Species||Reference||Route||LD50(mg/kg)||LDLo(mg/kg)||Adjusted LD||Derived value|
|Borzelleca et al. 1985Cabral et al. 1979
Deichmann et al. 1942
Deichmann et al. 1942
Fielder et al. 1982
|819 mg/m31,176 mg/m3
|82 mg/m3118 mg/m3
Human data: Dusts are particularly irritating to the eyes and nose at concentrations greater than 1 mg/m3 but concentrations up to 2.4 mg/m3 have been tolerated by workers that have been conditioned [Clayton and Clayton 1981]. It has been reported that 401 mg/kg is the minimum lethal oral dose [Haley 1977]. [Note: An oral dose of 401 mg/kg is equivalent to a worker being exposed to about 19,000 mg/m3 for 30 minutes, assuming a breathing rate of 50 liters per minute and 100% absorption.]
|Revised IDLH: 2.5 mg/m3Basis for revised IDLH: The revised IDLH for pentachlorophenol is 2.5 mg/m3 based on acute toxicity data in humans [Clayton and Clayton 1981]. This may be a conservative value due to the lack of relevant acute toxicity data for workers exposed to concentrations above 2.4 mg/m3.|
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