International Chemical Safety Cards

METHYLARSONIC ACID ICSC: 0755
METHYLARSONIC ACID
Methanearsonic acid
Monomethylarsinic acid
MAA
CH3AsO(OH)2 / CH5AsO3
Molecular mass: 140
CAS # 124-58-3
RTECS # PA1575000
ICSC # 0755
UN # 1557
EC # 033-002-00-5
TYPES OF
HAZARD/
EXPOSURE 		ACUTE HAZARDS/
SYMPTOMS 		PREVENTION FIRST AID/
FIRE FIGHTING
FIRE Not combustible. Gives off irritating or toxic fumes (or gases) in a fire.

In case of fire in the surroundings: all extinguishing agents allowed.
EXPLOSION


EXPOSURE
PREVENT DISPERSION OF DUST!

  • INHALATION
    		• Burning sensation. Cough. Sore throat.
    		Local exhaust or breathing protection.
    		Fresh air, rest. Refer for medical attention.
  • SKIN
    		• Redness.
    		Protective gloves.
    		Remove contaminated clothes. Rinse and then wash skin with water and soap.
  • EYES
    		• Redness.
    		Safety goggles, or eye protection in combination with breathing protection if powder.
    		First rinse with plenty of water for several minutes (remove contact lenses if easily possible), then take to a doctor.
  • INGESTION
    		• Burning sensation in the throat. Vomiting. Abdominal pain. Diarrhoea.
    		Do not eat, drink, or smoke during work. Wash hands before eating.
    		Rinse mouth. Refer for medical attention. See Notes.
    SPILLAGE DISPOSAL STORAGE PACKAGING & LABELLING
    Sweep spilled substance into containers; if appropriate, moisten first to prevent dusting. Carefully collect remainder, then remove to safe place (extra personal protection: P3 filter respirator for toxic particles).
    		Separated from reducing substances, strong bases, food and feedstuffs. Dry.
    		Do not transport with food and feedstuffs.
    T symbol
    R: 23/25
    S: (1/2-)20/21-28-45
    Note: A
    UN Hazard Class: 6.1
    UN Packing Group: I
    Marine pollutant.
    SEE IMPORTANT INFORMATION ON BACK
    ICSC: 0755 Prepared in the context of cooperation between the International Programme on Chemical Safety & the Commission of the European Communities © IPCS CEC 1993

    International Chemical Safety Cards

    METHYLARSONIC ACID ICSC: 0755

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    PHYSICAL STATE; APPEARANCE:
     WHITE, SLIGHTLY HYGROSCOPIC SOLID IN VARIOUS FORMS.

    PHYSICAL DANGERS:

    CHEMICAL DANGERS:
     The substance decomposes on heating producing toxic fumes (arsenic oxides - see ICSC # 0378). The solution in water is a medium strong acid. Reacts with reducing agents, active metals (such as iron, aluminium, zinc) producing toxic gas (methylarsine).

    OCCUPATIONAL EXPOSURE LIMITS (OELs):
     TLV not established.
    MAK not established.


    		ROUTES OF EXPOSURE:
     The substance can be absorbed into the body by inhalation of its aerosol and by ingestion.

    INHALATION RISK:
     Evaporation at 20░C is negligible; a harmful concentration of airborne particles can, however, be reached quickly when dispersed.

    EFFECTS OF SHORT-TERM EXPOSURE:
     The substance irritates the eyes, the skin and the respiratory tract. Medical observation is indicated. See Notes.

    EFFECTS OF LONG-TERM OR REPEATED EXPOSURE:
     The substance may have effects on the peripheral nervous system and liver.
    PHYSICAL
    PROPERTIES
    Melting point: 161░C
    		 Solubility in water: very good
    ENVIRONMENTAL
    DATA
    N O T E S
    Specific treatment is necessary in case of poisoning with this substance; the appropriate means with instructions must be available. The recommendations on this card also apply to monosodium methanarsonate and disodium methanarsonate.
    Transport Emergency Card: TEC (R)-61G64a
    ADDITIONAL INFORMATION


    ICSC: 0755 METHYLARSONIC ACID
    © IPCS, CEC, 1993
    IMPORTANT LEGAL NOTICE: Neither the CEC or the IPCS nor any person acting on behalf of the CEC or the IPCS is responsible for the use which might be made of this information. This card contains the collective views of the IPCS Peer Review Committee and may not reflect in all cases all the detailed requirements included in national legislation on the subject. The user should verify compliance of the cards with the relevant legislation in the country of use.