PARAQUAT (PARAQUAT DICHLORIDE)†

Chemical Identification
CAS # 4685-14-7
Formula

C₁₂H₁₄N₂+2

Synonyms

1,1'-dimethyl-4,4'-bipyridinium dichloride; N,N'-dimethyl-4,4'-bipyridinium dichloride; paraquat chloride; paraquat dichloride

Physical Properties
Physical description [herbicide] [Note: Paraquat may also be found commercially as a methyl sulfate
Boiling point decomposes Molecular weight 257.18
Freezing point/melting point 572°F (decomposes) Vapor pressure <0.0000001 mmHg
Flash point Vapor density
Specific gravity 1.24 Ionization potential
Lower explosive limit (LEL) Upper explosive limit (UEL)
NFPA health rating NFPA fire rating
NFPA reactivity rating NFPA special instruction
Vapor hazard ratio (VHR)
Historical exceedance percentage
Target organs
Monitoring Methods Used by OSHA
Analyte code (IMIS no.) 1982 (respirable dust)
Sampling group
Sampler/Sampling media PTFE filter, 1 µm [SKC 225-2705]
Sampling time*
Sampling volume (TWA)*

40-1000 L

Sampling flow rate (TWA)*

1-4 L/min

Sampling volume (STEL/Peak/C)*
Sampling flow rate (STEL/Peak/C)*
Analytical method instruments HPLC-UV
Method reference NIOSH 5003 (fully validated)
Notes
Special requirements

* All sampling instructions above are recommended guidelines for OSHA Compliance Safety and Health Officers (CSHOs), please see the corresponding OSHA method reference for complete details.

Wipe Method
Sampler/Sampling media
Bulk Method
Bulk Method
On-Site Screening Techniques
Device
Model/Type
Sampling information
(see manufacturer instructions)
Exposure Limits
OSHA PEL
8-hour TWA
(ST) STEL
(C) Ceiling
Peak
NIOSH REL
Up to 10-hour TWA
(ST) STEL
(C) Ceiling
ACGIH TLV©
8-hour TWA
(ST) STEL
(C) Ceiling
CAL/OSHA PEL
8-hour TWA
(ST) STEL
(C) Ceiling
Peak
PEL-TWA

0.5 mg/m³ (resp dust)

REL-TWA

0.1 mg/m³ (resp)

TLV-TWA

0.05 mg/m³ (inhalable particulate matter) [2017]

PEL-TWA

0.5 mg/m³ (total particulates), 0.1 mg/m³ (respirable sizes)

PEL-STEL REL-STEL TLV-STEL PEL-STEL
PEL-C REL-C TLV-C PEL-C
Skin notation

Y

Skin notation

Y

Skin notation

Y

Skin notation

Y

Notes:

See 29 CFR 1910.1000 Table Z-1.

Notes: Notes: Notes:

See footnote [n]

Health factors:  See NIH-NLM PubChem. IDLH

1 mg/m³

Carcinogenic classifications: TLV-A4 Notes:
AIHA emergency response planning guidelines - ERPG-1/ERPG-2/ERPG-3:

Last Updated Date : 01/07/2021