Product Name

  • Name

    Disodium methylarsonate

  • EINECS 205-620-7
  • CAS No. 144-21-8
  • Article Data9
  • CAS DataBase
  • Density 1.15
  • Solubility
  • Melting Point 132-139oC
  • Formula CH3AsNa2O3
  • Boiling Point 393.3 °C at 760 mmHg
  • Molecular Weight 183.934
  • Flash Point 205.8 °C
  • Transport Information
  • Appearance
  • Safety 26
  • Risk Codes 22
  • Molecular Structure Molecular Structure of 144-21-8 (Disodium methylarsonate)
  • Hazard Symbols HarmfulXn
  • Synonyms Methanearsonicacid, disodium salt (8CI);Ansar 184;Ansar 8100;Arifen;Arrhenal;Arsenil;Arsinyl;Arsynal;Cacodyl New;Cralo-E-rad;DMA;DMA 100;DSMA;Diarsen;Disodium methanearsonate;Disodium methylarsenate(2-);Disodium methylarsonate;Disomear;Methar;Metharsan;Metharsinat;Neo-Asycodile;Sodar;Somar;Stenosine;Tonarsan;Tonarsin;
  • PSA 63.19000
  • LogP -0.15340

Synthetic route

dimethyl sulfate
77-78-1

dimethyl sulfate

Arrhenal
144-21-8

Arrhenal

Conditions
ConditionsYield
With trisodium arsenite at 85℃;
arsenic(III) trioxide

arsenic(III) trioxide

methyl iodide
74-88-4

methyl iodide

Arrhenal
144-21-8

Arrhenal

Conditions
ConditionsYield
In not given in alkaline soln.; 75°C;;
In not given in alkaline soln.; 75°C;;
methyl iodide
74-88-4

methyl iodide

As2O3

As2O3

Arrhenal
144-21-8

Arrhenal

Conditions
ConditionsYield
With methanol; sodium hydroxide Reinigung des Produktes durch Versetzen mit Barytwasser, Behandeln mit CO2 und nochmaliges Faellen mit Alkohol; Ausbeute an reinem Dinatriumsalz mindestens 95prozent;
Arrhenal
144-21-8

Arrhenal

methyldiiodoarsine
7207-97-8

methyldiiodoarsine

Conditions
ConditionsYield
With hydrogenchloride; sulfur dioxide; potassium iodide for 6h;56%
Arrhenal
144-21-8

Arrhenal

4-oxy-3-amino-phenyl-arsin-oic acid

4-oxy-3-amino-phenyl-arsin-oic acid

alkaline Na2S2O4

alkaline Na2S2O4

4-oxy-3-amino-benzenarsenomethane

4-oxy-3-amino-benzenarsenomethane

...Expand
Arrhenal
144-21-8

Arrhenal

hydrogen

hydrogen

A

sodium carbonate

sodium carbonate

B

sodium pyromethylarsinate

sodium pyromethylarsinate

Conditions
ConditionsYield
at 140℃;
...Expand

Disodium methanearsenate Consensus Reports

EPA Genetic Toxicology Program. Arsenic and its compounds are on the Community Right-To-Know List.

Disodium methanearsenate Standards and Recommendations

OSHA PEL: TWA 0.5 mg(As)/m3
ACGIH TLV: BEI: 35 µ (As)/L inorganic arsenic and methylated metabolites in urine

Disodium methanearsenate Specification

The Disodium methanearsenate is an organic compound with the formula CH3AsNa2O3. The systematic name of this chemical is disodium methylarsonate. With the CAS registry number 144-21-8, it is also named as arsonic acid, As-methyl-, sodium salt (1:2). The product's categories are Alpha Sort; Arsenic Pesticides & Metabolites; D; DAlphabetic; DIO - DIZ; Herbicides; Pesticides & Metabolites.

Physical properties about Disodium methanearsenate are: (1)ACD/LogP: -1.75; (2)ACD/LogD (pH 5.5): -3.39; (3)ACD/LogD (pH 7.4): -4.98; (4)ACD/BCF (pH 5.5): 1; (5)ACD/BCF (pH 7.4): 1; (6)ACD/KOC (pH 5.5): 1; (7)ACD/KOC (pH 7.4): 1; (8)#H bond acceptors: 3; (9)#H bond donors: 2; (10)Polar Surface Area: 57.53 Å2; (11)Flash Point: 205.8 °C; (12)Enthalpy of Vaporization: 74.36 kJ/mol; (13)Boiling Point: 393.3 °C at 760 mmHg; (14)Vapour Pressure: 8.17E-08 mmHg at 25°C.

When you are using this chemical, please be cautious about it as the following:
It is if swallowed. In case of contact with eyes, rinse immediately with plenty of water and seek medical advice.

You can still convert the following datas into molecular structure:
(1)SMILES: [Na+].[Na+].[O-][As]([O-])(=O)C
(2)InChI: InChI=1/CH5AsO3.2Na/c1-2(3,4)5;;/h1H3,(H2,3,4,5);;/q;2*+1/p-2
(3)InChIKey: SDIXRDNYIMOKSG-NUQVWONBAA
(4)Std. InChI: InChI=1S/CH5AsO3.2Na/c1-2(3,4)5;;/h1H3,(H2,3,4,5);;/q;2*+1/p-2
(5)Std. InChIKey: SDIXRDNYIMOKSG-UHFFFAOYSA-L

The toxicity data is as follows:

Organism Test Type Route Reported Dose (Normalized Dose) Effect Source
mouse LD50 intraperitoneal > 1gm/kg (1000mg/kg)   National Technical Information Service. Vol. AD691-490,
mouse LD50 oral 1150mg/kg (1150mg/kg)   Japan Pesticide Information. Vol. (3), Pg. 5, 1970.
rabbit LD50 skin 10gm/kg (10000mg/kg)   Farm Chemicals Handbook. Vol. -, Pg. C119, 1991.
rat LC50 inhalation > 22100mg/m3/4 (22100mg/m3)   Farm Chemicals Handbook. Vol. -, Pg. C119, 1991.
rat LD50 oral 821mg/kg (821mg/kg)   Fundamental and Applied Toxicology. Vol. 7, Pg. 299, 1986.

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