Manganese

Formula
Mn
Structure
Description
A lustrous brittle silvery solid.
Uses
In the Manufacture of steel, for rock crushers, railway points and crossings, wagon buffers, as a constituent of several alloys, e.G., Ferromanganese, copper manganese, manganin.

Registry Numbers and Inventories.
CAS
7439-96-5
EC (EINECS/ELINCS)
231-105-1
RTECS
OO9275000
RTECS class
Tumorigen; Human Data; Primary Irritant
UN (DOT)
3089
Merck
12,5762
Beilstein/Gmelin
699 (G)
Swiss Giftliste 1
G-2385
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Korea ECL
Listed

Properties.
Formula
Mn
Formula mass
54.93
Melting point, °C
1260
Boiling point, °C
2097
Vapor pressure, mmHg
1 at 1292 C
Density
7.2 g/cm3
Solubility in water
Insoluble (reacts)
Heat of vaporization
221 kJ/mol

Hazards and Protection.
Storage
Protect containers against physical damage.
Handling
All chemicals should be considered hazardous. Avoid direct physical contact. Use appropriate, approved safety equipment. Untrained individuals should not handle this chemical or its container. Handling should occur in a chemical fume hood.
Protection
Wear appropriate protective gloves, clothing and goggles.
Respirators
Wear positive pressure self-contained breathing apparatus (SCBA).
Small spills/leaks
ELIMINATE all ignition sources. Do not touch or walk through spilled material. Stop leak if you can do it without risk.
Stability
Superficially oxidized on exposure to air.
Incompatibilities
Reacts with manganese with incandescence and a feeble explosion.
Decomposition
Decomposition cold water slowly, rapidly on heating; converted by fluorine into di- and trifluoride, by chlorine into the dichloride. Toxic fumes are formed when this material is heated.

Fire.
Fire fighting
Use dry chemical to extinguish.
Fire potential
Moderate fire hazard, in form of dust or powder, when exposed to flame.
Hazards
Oxides from metallic fires are a severe health hazard. Fire may produce irritating, corrosive and/or toxic gases.

Health.
Exposure limit(s)
TLV (as TWA): ppm; 5 (dust) or 1 (fume) mg/m3; as STEL: 3 mg/m3 (fume) (ACGIH 1994-1995). MAK: ppm; 0.5 mg/m3 (1994).
Poison_Class
4
Exposure effects
Effects include a parkinsonism-like syndrome, muscle weakness, impairment of speech, gait disturbances, tremor, slurred speech, diminished libido and behavioral disturbances. Symptoms may last 1 to 2 months or longer. Manganese injection has produced teratogenic effects in experimental animals, although ingestion and inhalation studies showed no effect. Manganese deficiency during gestation has demonstrated adverse effects on the central nervous system of the developing fetus in experimental animals.
   Ingestion
See Inhalation.
   Inhalation
Pleuritis and/or severe or fatal pneumonia have been reported among manganese workers.
   Skin
See Inhalation.
   Eyes
See Inhalation.

First aid
 
   Ingestion
Most exposures to manganese are chronic. Emesis and activated charcoal may not be useful in chronic cases. Activated charcoal: administer charcoal as a slurry (240 ml water/30 g charcoal). Usual dose: 25 to 100 g in adults/adolescents.
   Inhalation
Move victim to fresh air. Apply artificial respiration if victim is not breathing. Administer oxygen if breathing is difficult.
   Skin
Remove and isolate contaminated clothing and shoes. Immediately flush with running water for at least 20 minutes.
   Eyes
Immediately flush with running water for at least 20 minutes.

Transport.
UN number
3089
Response guide
Hazard class
4.1
Packing Group
II; III