PAC Database - Detailed Chemical Data
Chemical Identity
| Chemical | CAS# | UN# | Health Code Numbers | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cyanide | 57-12-5 | 1588 |
14.01
11.01
14.02
4.08
4.05
7.01
11.00
4.07
3.11
|
|||||||||
| Formula | Synonyms | |||||||||||
| CN | CYANIDES, INORGANIC, N.O.S., CYANIDE SOLUTION, N.O.S., CARBON NITRIDE ION (CN1-), CIANUROS, INORGÁNICOS, N.E.O.M. (DOT SPANISH), CIANUROS, INORGÁNICOS, SÓLIDOS, N.E.O.M. (DOT SPANISH), CYANIDE (CN1-), CYANIDE ANION, CYANIDE ION, CYANIDE ION (CN(1-)), CYANIDE ION(1-), CYANIDE(1-), CYANIDE(1-) ION, CYANIDES (SOLUBLE SALTS AND COMPLEXES), CYANIDES, INORGANIC, SOLID, N.O.S., CYANURES, INORGANIQUES, N.S.A. (DOT FRENCH), CYANURES, INORGANIQUES, SOLIDES, N.S.A. (DOT FRENCH), HYDROCYANIC ACID, ION(1-), ISOCYANIDE, NITRILE ANION | |||||||||||
Physical Properties
| Mol Wt | State | MP (°C) | BP (°C) | VP (Hg) | VP (°C) | SG | LEL (ppm) |
|---|---|---|---|---|---|---|---|
| 26.02 | S |
PAC Values
| PAC-1 | PAC-2 | PAC-3 |
|---|---|---|
| 0.45 | 5.0 | 25 |
| PAC-1 | PAC-2 | PAC-3 |
|---|---|---|
| 0.42 | 4.7 | 23 |
Technical Basis
A review of available sources identified the following exposure limits: PEL-TWA, ceiling limits (REL, TLV), and IDLH (1990 and 1994). Data sources were selected according to the hierarchy listed in Table 3.1. Analysts evaluated the original (1990) and revised (1994) IDLH sources and determined that the inclusion of acute inhalation toxicity data is relevant to TEEL development; as such, the 1994 IDLH was selected as the TEEL-3. The TLV-C was selected as the TEEL-2. The PEL-TWA was considered as a TEEL-1; however, it resulted in a TEEL-1 > TEEL-2. Instead, the TEEL-1 values were derived according to Table 3.5.
• TEEL-1 = TEEL-2/11
• TEEL-2 = TLV-C (5 mg/m3)
• TEEL-3 = IDLH (1994, 25 mg/m3)
This review generated TEEL values inconsistent with Rev. 29A. The Rev. 29A TEEL-3 was the 1990 IDLH, while the current TEEL-3 is the 1994 IDLH due to its inclusion of acute human toxicity data. The 1994 IDLH was used according to Handbook guidelines (Section 4.2-4.3). The Rev. 29A TEEL-2 was derived from the TEEL-3, while the current TEEL-2 is an exposure limit (TLV-C). The Rev. 29A TEEL-1 was a MAK-TWA, while the current TEEL-1 was derived from the TEEL-2, which was implemented according to Handbook guidelines (Section 4.2-4.3) to resolve a TEEL-1 > TEEL-2.
• TEEL-1 = TEEL-2/11
• TEEL-2 = TLV-C (5 mg/m3)
• TEEL-3 = IDLH (1994, 25 mg/m3)
This review generated TEEL values inconsistent with Rev. 29A. The Rev. 29A TEEL-3 was the 1990 IDLH, while the current TEEL-3 is the 1994 IDLH due to its inclusion of acute human toxicity data. The 1994 IDLH was used according to Handbook guidelines (Section 4.2-4.3). The Rev. 29A TEEL-2 was derived from the TEEL-3, while the current TEEL-2 is an exposure limit (TLV-C). The Rev. 29A TEEL-1 was a MAK-TWA, while the current TEEL-1 was derived from the TEEL-2, which was implemented according to Handbook guidelines (Section 4.2-4.3) to resolve a TEEL-1 > TEEL-2.
References
Chemical information: https://pubchem.ncbi.nlm.nih.gov/compound/Cyanide-ion.
Exposure limits, cyanide (as CN): https://www.osha.gov/chemicaldata/787
IDLH, cyanides (as CN): https://www.cdc.gov/niosh/idlh/cyanides.html