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DIMETHYL MERCURY ICSC: 1304
Date of Peer Review: May 2003

Mercury, dimethyl
CAS # 593-74-8 (CH3)2Hg
RTECS # OW3010000 Molecular mass: 230.7
UN # 2024
EC # 080-007-00-3
TYPES OF HAZARD / EXPOSURE ACUTE HAZARDS / SYMPTOMS PREVENTION FIRST AID / FIRE FIGHTING
FIRE Highly flammable. Gives off irritating or toxic fumes (or gases) in a fire.
NO open flames, NO sparks, and NO smoking.
Powder, water spray, foam, carbon dioxide.
EXPLOSION

In case of fire: keep drums, etc., cool by spraying with water.
EXPOSURE
AVOID ALL CONTACT! AVOID EXPOSURE OF (PREGNANT) WOMEN!
IN ALL CASES CONSULT A DOCTOR!
Inhalation Cough. Sore throat. Loss of movement co-ordination. Tremor. Confusion. Symptoms may be delayed (see Notes).
Ventilation, local exhaust, or breathing protection.
Fresh air, rest. Refer for medical attention.
Skin MAY BE ABSORBED! Redness. Pain.
Protective gloves. Protective clothing.
Rinse skin with plenty of water or shower. Refer for medical attention.
Eyes Redness. Pain.
Safety goggles, or eye protection in combination with breathing protection.
First rinse with plenty of water for several minutes (remove contact lenses if easily possible), then take to a doctor.
Ingestion Abdominal pain. Nausea. Vomiting. Diarrhoea. Shock or collapse. (Further see Inhalation).
Do not eat, drink, or smoke during work. Wash hands before eating.
Rinse mouth. Induce vomiting (ONLY IN CONSCIOUS PERSONS!). Wear protective gloves when inducing vomiting. Refer for medical attention.
SPILLAGE DISPOSAL PACKAGING & LABELLING
Remove all ignition sources. Collect leaking liquid in covered containers. Absorb remaining liquid in sand or inert absorbent and remove to safe place. Do NOT wash away into sewer. Do NOT let this chemical enter the environment. Chemical protection suit including self-contained breathing apparatus.
Do not transport with food and feedstuffs. Severe marine pollutant.
EU Classification
Symbol: T+, N
R: 26/27/28-33-50/53
S: (1/2-)-13-28-36-45-60-61
Note: [1 for preparations.]
UN Classification
UN Hazard Class: 6.1
UN Pack Group: I
EMERGENCY RESPONSE STORAGE
Transport Emergency Card: TEC (R)-61GT4-I
Fireproof. Provision to contain effluent from fire extinguishing. Separated from food and feedstuffs, halogens and oxidants. Well closed.
IPCS
International
Programme on
Chemical Safety
Prepared in the context of cooperation between the International Programme on Chemical Safety and the Commission of the European Communities IPCS, CEC 1999

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DIMETHYL MERCURY ICSC: 1304
IMPORTANT DATA
PHYSICAL STATE; APPEARANCE:
COLOURLESS LIQUID.

PHYSICAL DANGERS:
The vapour is heavier than air and may travel along the ground; distant ignition possible.

CHEMICAL DANGERS:
The substance decomposes on burning producing toxic gases, including mercury oxides. Reacts with halogens and oxidants causing fire hazard.

OCCUPATIONAL EXPOSURE LIMITS:
TLV: (as Hg) 0.01 mg/m, as TWA; 0.03 mg/m, as STEL; (skin); (ACGIH 2003). MAK: H, Sh; Carcinogen category: 3B; (DFG 2002).
ROUTES OF EXPOSURE:
The substance can be absorbed into the body by inhalation of its vapour, through the skin and by ingestion.

INHALATION RISK:
A harmful contamination of the air can be reached very quickly on evaporation of this substance at 20C.

EFFECTS OF SHORT-TERM EXPOSURE:
The substance is irritating to the eyes, the skin and the respiratory tract. The substance may cause effects on the central nervous system, resulting in impaired functions. Exposure may result in death. The effects may be delayed. Medical observation is indicated.

EFFECTS OF LONG-TERM OR REPEATED EXPOSURE:
The substance may have effects on the central nervous system, resulting in impaired functions. This substance is possibly carcinogenic to humans. Causes toxicity to human reproduction or development.
PHYSICAL PROPERTIES
Boiling point: 93-94C
Melting point: -43C
Density: 2.961 g/cm^3
Solubility in water: none
Relative density of the vapour/air-mixture at 20C (air = 1): 1.5
Flash point: 5C
ENVIRONMENTAL DATA
The substance is very toxic to aquatic organisms. Bioaccumulation of this chemical may occur along the food chain, for example in seafood. The substance may cause long-term effects in the aquatic environment.
NOTES
Depending on the degree of exposure, periodic medical examination is suggested. Do NOT take working clothes home.
ADDITIONAL INFORMATION


LEGAL NOTICE Neither the CEC nor 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
IPCS, CEC 1999