PAC Database - Detailed Chemical Data
Chemical Identity
| Chemical | CAS# | UN# | Health Code Numbers | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Pyrrole; (Imidole) | 109-97-7 |
8.00
7.01
4.10
11.00
4.01
4.08
14.01
4.09
|
||||||||||
| Formula | Synonyms | |||||||||||
| C4.H5.N | ||||||||||||
Physical Properties
| Mol Wt | State | MP (°C) | BP (°C) | VP (Hg) | VP (°C) | SG | LEL (ppm) |
|---|---|---|---|---|---|---|---|
| 67.1 | L | -23.4 | 129.7 | 8.35 | 25 | 0.9698 @ 20°C |
PAC Values
| PAC-1 | PAC-2 | PAC-3 |
|---|---|---|
| 0.32 | 3.5 | 21 |
| PAC-1 | PAC-2 | PAC-3 |
|---|---|---|
| 0.12 | 1.3 | 7.7 |
Technical Basis
A review of available sources identified acute toxicity data (LC50, LD50, LDLo) for several species and routes. Data sources were selected according to the hierarchy listed in Table 3.1. Toxicity data were selected according to type of exposure, species, and route according to the hierarchies stated in Sections 3.3.1, 3.3.2, and evaluated using factors in Tables 3.2, 3.3, and 3.4. Inhalation exposures were scaled to 60-minute equivalents using the ten Berge equation (Section 3.3.4). The rat LC50 was evaluated as a TEEL-3 basis, but the source could not be verified as reliable (Section 3.3.1). Instead, a mouse intraperitoneal LD50 was selected as the TEEL-3 basis. TEEL-2 and TEEL-1 values were derived according to Table 3.5.
• TEEL-1 = TEEL-2/11
• TEEL-2 = TEEL-3/6
• TEEL-3 = Mouse intraperitoneal LD50 (98 mg/kg)
This review generated a TEEL-3 value consistent with Rev. 29A. The Rev. 29A and current TEEL-2/TEEL-1 use the same methodology, with minor differences in the TEEL values due to rounding.
• TEEL-1 = TEEL-2/11
• TEEL-2 = TEEL-3/6
• TEEL-3 = Mouse intraperitoneal LD50 (98 mg/kg)
This review generated a TEEL-3 value consistent with Rev. 29A. The Rev. 29A and current TEEL-2/TEEL-1 use the same methodology, with minor differences in the TEEL values due to rounding.
References
Chemical information: https://pubchem.ncbi.nlm.nih.gov/compound/Pyrrole
Mouse LD50. Progress in Biochemical Pharmacology., 1(542), 1965. Retrieved from: https://pubchem.ncbi.nlm.nih.gov/compound/Pyrrole
Rat LC50 2,270 mg/m3/4H: https://haz-map.com/Agents/6924