PAC Database - Detailed Chemical Data
Chemical Identity
| Chemical | CAS# | UN# | Health Code Numbers | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Paraquat | 4685-14-7 |
4.01
11.01
4.08
4.05
7.01
8.00
11.00
4.02
4.09
4.10
|
||||||||||
| Formula | Synonyms | |||||||||||
| C12H14N2 | ||||||||||||
Physical Properties
| Mol Wt | State | MP (°C) | BP (°C) | VP (Hg) | VP (°C) | SG | LEL (ppm) |
|---|---|---|---|---|---|---|---|
| 186.25 | S | 20 | 1.24 @ 20°C |
PAC Values
| PAC-1 | PAC-2 | PAC-3 |
|---|---|---|
| 0.15 | 0.25 | 1.5 |
| PAC-1 | PAC-2 | PAC-3 |
|---|---|---|
| 0.020 | 0.033 | 0.20 |
Technical Basis
Paraquat is a cation, chemically available as paraquat dichloride. A review of available sources identified the following exposure limits: IDLH (1990) and TWAs (PEL, REL, TLV). Data sources were selected according to the hierarchy listed in Table 3.1. The IDLH (1990) was selected as the TEEL-3. The TEEL-2 value was derived according to Table 3.5. The TLV-TWA was selected as the TEEL-1 basis.
• TEEL-1 = TLV-TWA (0.05 mg/m3) x 3
• TEEL-2 = TEEL-3/6
• TEEL-3 = IDLH (1990, 1.5 mg/m3)
This review generated TEEL values inconsistent with Rev. 29A. The Rev. 29A TEEL-3 basis was rat intraperitoneal LDLo, while the current TEEL-3 is an IDLH, a more preferred source (Table 3.1). The Rev. 29A and current TEEL-2 use the same methodology (Table 3.5), with differences due to the change in TEEL-3. The Rev. 29A and current TEEL-1 use the same basis (TLV-TWA) and methodology (Table 3.5), with differences due to a revision of the value in 2017.
• TEEL-1 = TLV-TWA (0.05 mg/m3) x 3
• TEEL-2 = TEEL-3/6
• TEEL-3 = IDLH (1990, 1.5 mg/m3)
This review generated TEEL values inconsistent with Rev. 29A. The Rev. 29A TEEL-3 basis was rat intraperitoneal LDLo, while the current TEEL-3 is an IDLH, a more preferred source (Table 3.1). The Rev. 29A and current TEEL-2 use the same methodology (Table 3.5), with differences due to the change in TEEL-3. The Rev. 29A and current TEEL-1 use the same basis (TLV-TWA) and methodology (Table 3.5), with differences due to a revision of the value in 2017.
References
Chemical information: https://pubchem.ncbi.nlm.nih.gov/compound/Paraquat
IDLH. https://www.cdc.gov/niosh/idlh/1910425.html
TWAs. https://www.osha.gov/chemicaldata/375