百草枯二氯化物

Description

Paraquat dichloride · CAS 1910-42-5 · C12H14N2.2Cl. UNII 2KZ83GSS73. Melting Point: Decomposes 572 °F (EPA, 1998); Density: 1.24 g/cm³; Density: 1.24.

Identification

CAS Registry Number	1910-42-5
PubChem CID	15938
Molecular formula	C12H14N2.2Cl
IUPAC name	1-methyl-4-(1-methylpyridin-1-ium-4-yl)pyridin-1-ium dichloride
UNII (FDA)	2KZ83GSS73

Computed Descriptors

Molecular Weight	257.16
Hydrogen Bond Donor Count	0
Hydrogen Bond Acceptor Count	2
Rotatable Bond Count	1
Exact Mass	256.0534038
Monoisotopic Mass	256.0534038
Topological Polar Surface Area	7.8
Heavy Atom Count	16
Formal Charge	0
Complexity	145

Physical & Chemical Properties

Melting Point	Decomposes 572 °F (EPA, 1998)
Density	1.24 g/cm³
Density	1.24
Vapor Pressure	Approximately 0 (EPA, 1998)
Vapor Pressure	0.0000001 [mmHg]
Vapor Pressure	<0.0000001 mmHg
LogP	-4.5
Decomposition	300 °C

Physical description & handling notes

• Paraquat dichloride is a colorless to yellow crystalline solid. Used as a contact herbicide and desiccant. (EPA, 1998)
• Yellow solid with a faint, ammonia-like odor. [herbicide] [Note: Paraquat may also be found commercially as a methyl sulfate salt C12H14N2+2CH3SO4.]; [NIOSH]
• COLOURLESS HYGROSCOPIC CRYSTALS.
• [herbicide] [Note: Paraquat may also be found commercially as a methyl sulfate
• Decomposes (NIOSH, 2024)
• decomposes

GHS Hazard Classification

Reported hazard statements	H301, H311, H315, H319, H330, H335, H372, H400

Documented Uses

• Used as a contact herbicide on weeds; [EXTOXNET] Used in animal experiments as a model of Parkinson's syndrome at doses several orders of magnitude greater than occupational exposure levels; [PMID 16217247]
• Paraquat is used as a quaternary ammonium herbicide; one of the most widely used herbicides in the world. It is also often used in science to catalyze the formation of reactive oxygen species (ROS). (L421).
• Paraquat is poorly absorbed after oral exposure. It is not metabolized but is reduced to an unstable free radical which is then re-oxidized to reform the cation and produce a superoxide anion. It is excreted moslty in the urine,and in small fraction also in the feces (A606, L1008).
• Animal studies: less than 6 hours; other animal studies have found measurable paraquat 26 days after ingestion; [TDR, p. 991]

Synonyms

Paraquat dichloride; 1910-42-5; Methyl viologen; Methyl viologen dichloride; Pathclear; Pillarxone; Crisquat; Dexuron; Gramixel; Gramuron; Esgram; Toxer total; 1,1'-Dimethyl-4,4'-bipyridinium dichloride; Ortho paraquat cl; Paraquat-dichloride; Cekuquat

Frequently Asked Questions

What are the CAS number and molecular formula of Paraquat dichloride?

CAS 1910-42-5; molecular formula C12H14N2.2Cl; molecular weight — g/mol.

What other names is Paraquat dichloride known by?

Paraquat dichloride, 1910-42-5, Methyl viologen, Methyl viologen dichloride, Pathclear, Pillarxone.

Is Paraquat dichloride classified as hazardous?

Hazard statements reported: H301, H311, H315, H319, H330.

What are the key physical properties of Paraquat dichloride?

Melting Point: Decomposes 572 °F (EPA, 1998); Density: 1.24 g/cm³; Density: 1.24; Vapor Pressure: Approximately 0 (EPA, 1998).

Facts on this page are taken from PubChem (US National Library of Medicine) and Wikidata. Grade-specific data — assay, moisture, particle size, packaging, shelf life — is issued per batch on the COA and is not published here.