甲基胂酸二钠

Description

DSMA · CAS 144-21-8 · CH3AsNa2O3. UNII 7NK4BV40VN. Melting Point: >355 °C; Solubility: In water, 4.32X10+5 mg/l @ 25 °C; Density: 1.04 g/ml.

Identification

CAS Registry Number	144-21-8
PubChem CID	8947
Molecular formula	CH3AsNa2O3
IUPAC name	disodium;methyl-dioxido-oxo-λ5-arsane
UNII (FDA)	7NK4BV40VN

Computed Descriptors

Molecular Weight	183.934
Hydrogen Bond Donor Count	0
Hydrogen Bond Acceptor Count	3
Rotatable Bond Count	0
Exact Mass	183.909352
Monoisotopic Mass	183.909352
Topological Polar Surface Area	63.2
Heavy Atom Count	7
Formal Charge	0
Complexity	49.8

Physical & Chemical Properties

Melting Point	>355 °C
Solubility	In water, 4.32X10+5 mg/l @ 25 °C
Density	1.04 g/ml
Vapor Pressure	0.0000001 [mmHg]
Vapor Pressure	10-7 mm Hg @ 25 °C
LogP	Kow = <10
Dissociation Constants	pKa1 = 4.1; pKa2 = 8.94

Physical description & handling notes

• Colorless hygroscopic solid; [Hawley]
• Hydrated crystals containing 5H2O or 6H2O
• Monoclinic spear-shaped plates from absolute alcohol
• White crystalline solid
• Pleasant acid taste
• Melting point 132-139 °C /Disodium methanearsonate hexahydrate/

GHS Hazard Classification

Reported hazard statements	H301 (95%), H331 (97.5%), H400 (100%), H410 (97.5%)

Documented Uses

• Used as herbicide for control of grass weeds in turf, cotton, and non-crop areas; Also used in pharmaceuticals; [HSDB]
• Recommended to control grass weeds on non-crop areas; directed spray under trees.
• USEFUL AS DIRECTED APPLICATION ... FOR POST-EMERGENT CONTROL OF WEEDS AND GRASSES, IN ZOYSIA, BLUEGRASS, AND BERMUDA GRASS LAWNS, GENERAL NON-CROP WEED CONTROL ... .
• For more Uses (Complete) data for DISODIUM METHANEARSONATE (6 total), please visit the HSDB record page.
• Reaction of methyl chloride with sodium arsenate.
• Prepared from sodium arsenite and methyl iodide.

Synonyms

144-21-8; Disodium methylarsonate; DISODIUM METHANEARSONATE; Disomear; DSMA; Metharsan; Stenosine; Tonarsan; Tonarsin; Arsynal; Diarsen; Methar; Namate; Somar; Neo-Asycodile; Weed broom

Frequently Asked Questions

What are the CAS number and molecular formula of DSMA?

CAS 144-21-8; molecular formula CH3AsNa2O3; molecular weight — g/mol.

What other names is DSMA known by?

144-21-8, Disodium methylarsonate, DISODIUM METHANEARSONATE, Disomear, DSMA, Metharsan.

Is DSMA classified as hazardous?

Hazard statements reported: H301, H331, H400, H410.

What are the key physical properties of DSMA?

Melting Point: >355 °C; Solubility: In water, 4.32X10+5 mg/l @ 25 °C; Density: 1.04 g/ml; Vapor Pressure: 0.0000001 [mmHg].

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.