Potassium manganate

  • Manganic acid (H2MnO4), dipotassium salt
  • Potassium manganese oxide
  • Dipotassium manganate
  • Potassium manganate(VI)
Formula
K2MnO4
Structure
Description
Dark green powder.

Registry Numbers and Inventories.
CAS
10294-64-1
EC (EINECS/ELINCS)
233-665-2
UN (DOT)
1479
Merck
12,7810
Canada DSL/NDSL
NDSL
US TSCA
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
K2MnO4
Formula mass
197.13
Melting point, °C
190 (decomposes)
Boiling point, °C
 
Solubility in water
Decomposes

Hazards and Protection.
Storage
Keep container tightly sealed.Store in cool, dry conditions in well sealed containers.
Protection
Protective work clothing. Chemical protective gloves. Safety glasses or goggles.
Small spills/leaks
Pick up mechanically.
Stability
Decomposition will not occur if used and stored according to specifications.
Incompatibilities
Reducing agents, easily oxidized materials, organic materials, flammable substances.
Decomposition
Metal oxide fumes.

Fire.
Fire fighting
Extinguish with carbon dioxide, extinguishing powder or water spray. Fight larger fires with water spray or alcohol resistant foam. Wear self-contained respirator. Wear fully protective impervious suit.
Fire potential
This substance is an oxidizer and its heat of reaction with reducing agents or combustibles may cause ignition.
Health
1
 
Flammability
0
 
 
Reactivity
1
 
 
Special
O

Health.
Exposure limit(s)
NIOSH PEL: 5 mg/m3 (as Mn fume)
Exposure effects
Chronic exposure to manganese may cause impairment to the central nervous system. Symptoms include sluggishness, sleepiness, muscle weakness, loss of facial muscle control, edema, emotional disturbances, spastic gait and falling. Chronic manganese poisoning may develop after as little as three months of heavy exposure but usually cases develop after one to three years of exposure.

First aid
 
   Ingestion
Seek medical treatment.
   Inhalation
Supply fresh air. If required, provide artificial respiration. Keep patient warm. Seek immediate medical advice.
   Skin
Immediately wash with water and soap and rinse thoroughly. Seek immediate medical advice.
   Eyes
Rinse opened eye for several minutes under running water. Then consult a doctor.

Transport.
UN number
1479
Response guide
Hazard class
5.1
Packing Group
III