PAC Database - Detailed Chemical Data
Chemical Identity
| Chemical | CAS# | UN# | Health Code Numbers | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Paraquat dichloride | 1910-42-5 | 2781 |
14.01
11.01
4.05
4.01
7.01
8.00
11.00
4.06
4.09
4.10
|
|||||||||
| Formula | Synonyms | |||||||||||
| C12H14Cl2N2 | PARAQUAT DICHLORIDE, 1,1^-DIMETHYL-4,4'-BIPYRIDINIUM DICHLORIDE, 1,1'-DIMETHYL-4,4'-BIPYRIDYNIUM DICHLORIDE, 1,1'-DIMETHYL-4,4'-DIPYRIDINIUM DICHLORIDE, 1,1'-DIMETHYL-4,4'-DIPYRIDYLIUM CHLORIDE, 1,1'-DIMETHYL-4,4'-DIPYRIDYLIUM DICHLORIDE, 1,1'-DIMETHYL-4,4-BIPYRIDINIUM DICHLORIDE, 4,4'-BIPYRIDINIUM, 1,1'-DIMETHYL-, DICHLORIDE, 4,4'-DIMETHYLDIPYRIDYL DICHLORIDE, AH 501, BIPYRIDINIUM, 1,1'-DIMETHYL-4,4'-, DICHLORIDE, CEKUQUAT, CRISQUAT, DEXTRONE-X, DEXURON, DIMETHYL VIOLOGEN CHLORIDE, ESGRAM, GALOKSON, GRAMIXEL, GRAMONOL, GRAMOXONE, GRAMOXONE D, GRAMOXONE DICHLORIDE, GRAMOXONE S, GRAMOXONE W, GRAMURON, METHYL VIOLOGEN, METHYL VIOLOGEN DICHLORIDE, METHYL VIOLOGEN DICHLORIDE HYDRATE, METHYL VIOLOGEN DICHLORIDE TRIHYDRATE, METHYL VIOLOGEN(REDUCED), METHYLVIOLOGEN, METHYLVIOLOGEN CHLORIDE, N,N'-DIMETHYL-4,4'- BIPYRIDYNIUM DICHLORIDE, N,N'-DIMETHYL-4,4'-BIPYRIDINIUM DICHLORIDE, N,N'-DIMETHYL-4,4'-BIPYRIDYLIUM DICHLORIDE, N,N'-DIMETHYL-4,4'-DIPYRIDYLIUM DICHLORIDE, OK 622, ORTHO PARAQUAT CL, PARA-COL, PARAGREEN A, PARAQUAT CHLORIDE, PARAQUAT CL, PARAQUAT, DICHLORIDE, PATHCLEAR, PILLAQUAT, PILLARXONE, TERRAKLENE, TOTACOL, TOXER TOTAL, VIOLOGEN, METHYL-, WEEDOL | |||||||||||
Physical Properties
| Mol Wt | State | MP (°C) | BP (°C) | VP (Hg) | VP (°C) | SG | LEL (ppm) |
|---|---|---|---|---|---|---|---|
| 257.16 | S |
PAC Values
| PAC-1 | PAC-2 | PAC-3 |
|---|---|---|
| 0.15 | 0.25 | 1.5 |
| PAC-1 | PAC-2 | PAC-3 |
|---|---|---|
| 0.014 | 0.024 | 0.14 |
Technical Basis
Paraquat dichloride is soluble, therefore it can be expected to be available as paraquat (C12H14N2+2, CASRN: 4685-14-7) when inhaled. 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 x 3 (0.05 mg/m3 )
• TEEL-2 = TEEL-3/6
• TEEL-3 = IDLH (1.5 mg/m3)
This review generated TEEL values inconsistent with Rev. 29A. The Rev. 29A TEEL-3 basis was monkey oral LD50, 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 x 3 (0.05 mg/m3 )
• TEEL-2 = TEEL-3/6
• TEEL-3 = IDLH (1.5 mg/m3)
This review generated TEEL values inconsistent with Rev. 29A. The Rev. 29A TEEL-3 basis was monkey oral LD50, 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-dichloride.
IDLH. https://www.cdc.gov/niosh/idlh/1910425.html
Exposure limits: https://www.osha.gov/chemicaldata/375