Lead tungstate

  • Lead tungstate(IV)
  • Lead tungsten tetraoxide
  • Lead wolframate
  • Natural raspite
  • Natural stolzite
  • Scheelite
Formula
PbWO4
Structure
Description
White to pale yellow powdery solid.
Uses
Pigment.

Registry Numbers and Inventories.
CAS
7759-01-5
EC (EINECS/ELINCS)
231-849-7
Beilstein/Gmelin
178279 (G)
RCRA
D008
Canada DSL/NDSL
NDSL
US TSCA
Listed
Korea ECL
Listed

Properties.
Formula
O4PbW
Formula mass
455.05
Melting point, °C
1123
Density
8.235 g/cm3 (20 C)
Solubility in water
Insoluble
Thermal expansion
5.22E-5/K (27 C_

Hazards and Protection.
Storage
Keep in a cool, dry, dark location in a tightly sealed container or cylinder. Keep away from incompatible materials, ignition sources and untrained individuals. Secure and label area. Protect containers/cylinders from 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 clothing to prevent any reasonable probability of skin contact. Wear eye protection to prevent any possibility of eye contact.
Respirators
A combination respirator, which includes a type c supplied air respirator with a full facepiece, operated in pressure demand or other positive pressure or continuous flow mode and an auxiliary, self contained, breathing apparatus operated in pressure demand or other positive pressure mode.
Small spills/leaks
Evacuate area and ventilate. Wear protective equipment. If required, use an inert absrobent. Sweep up and place in an appropriate container for disposal. Wash contaminated surfaces.
Stability
No data.
Incompatibilities
Avoid contact with strong oxidizers, hydrogen peroxide, and the active metals, sodium and potassium.

Fire.
Fire fighting
Wear goggles and self-contained breathing apparatus. Self-contained breathing apparatus with a full facepiece, operated in pressure-demand or other positive pressure mode.
Fire potential
Not flammable
Combustion products
Toxic metal fumes Can emit toxic metal fumes.

Health.
Exposure limit(s)
50 µg/m3 PEL
Carcinogin
G-A3, I-2B, CP65
Exposure effects
Chronic lead exposure may cause elevated blood pressure and gout. In young children, developmental defects, including learning disabilities and behavioral abnormalities, can occur without symptoms at blood lead levels above 10 micrograms/deciliter. At higher levels of exposure headache, fatigue, irritability and malaise may occur. At high levels, encephalopathy, seizures and focal neurologic findings with imminent risk of death, permanent mental retardation, and motor deficits may occur. Lead is transferred across the placenta. It can affect reproduction in males and females, and affects neurodevelopmental milestones in children with both prenatal and postnatal exposure.
   Ingestion
Chronic lead exposure: abdominal pain, nausea, anorexia, vomiting, constipation, diarrhea, and a metallic taste in the mouth have been reported with chronic toxicity. Severe and paroxysmal colic characterized by a rigid and retracted abdomen may occur.
   Inhalation
INHALATION: Joint and muscle pains, headache, dizziness and insomnia. Weakness, frequently of extensor muscles of hand and wrist (unilateral or bilateral). Heavy contamination - Brain damage. Stupor progressing to coma - with or without convulsion, often death. Excitation, confusion, and mania less common. Cerebrospinal pressure may be increased. INGESTION: Abdominal pain, diarrhea, constipation, loss of appetite, muscular weakness, headache, blue line on gums, metallic taste, nausea and vomiting, joint and muscle pain.
   Skin
See inhalation.
   Eyes
See inhalation

First aid
 
   Ingestion
Acute exposure - activated charcoal: administer charcoal as a slurry (240 ml water/30 g charcoal). Usual dose: 25 to 100 g in adults/adolescents. Consider gastric lavage in patients with recent ingestion of liquid or powdered products.
   Inhalation
Remove from further exposure.
   Skin
Wash with soap and water.
   Eyes
Flush with copious amounts of water.

Transport.
USCG CHRIS Code
LTU