Barium chromate

  • Barium chromate (1:1)
  • Barium chromate oxide
  • Barium chromate (Vi)
  • Lemon chrome
Formula
BaCrO4
Structure
Description
Yellow heavy monoclinic orthorhombic crystals.
Uses
As pigment almost entirely in anticorrosion jointing pastes to prevent electro-chemical corrosion at junctions of dissimilar metals, some use in artists' colors and in coloring glass, ceramics, porcelain, also used in metal primers, pyrotechnic compositions.

Registry Numbers and Inventories.
CAS
10294-40-3
EC (EINECS/ELINCS)
233-660-5
RTECS
CQ8760000
RTECS class
Tumorigen; Mutagen
UN (DOT)
1564
Merck
12,999
Beilstein/Gmelin
46113 (G)
RCRA
D005
Swiss Giftliste 1
G-1209
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
BaCrO4
Formula mass
253.32
Melting point, °C
1400
Density
3.9 g/cm3 (11 C)
Solubility in water
0.00034 g/100 cc @ 16 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 protective gloves, clothing and goggles.
Respirators
Wear positive pressure self-contained breathing apparatus (SCBA).
Small spills/leaks
ELIMINATE all ignition sources. Do not touch damaged containers or spilled material unless wearing appropriate protective clothing. Stop leak if you can do it without risk. Absorb or cover with dry earth, sand or other non-combustible material and transfer to containers. DO NOT GET WATER INSIDE CONTAINERS.
Stability
No data.
Incompatibilities
Reacts vigorously with reducing materials. Hydrazine is decomposed explosively by chromates.

Fire.
Fire fighting
Extinguish using agent most appropriate for surrounding fire.
Fire potential
Non-combustible, substance itself does not burn but may decompose upon heating to produce corrosive and/or toxic fumes.
Hazards
Contact with metals may evolve flammable hydrogen gas.
Combustion products
Fire may produce irritating, corrosive and/or toxic gases.

Health.
Exposure limit(s)
0.01 mg/m3 TLV
Carcinogin
G-A1, I-1, N-1, CP65
Poison_Class
2
Exposure effects
Hepatic encephalopathy, cerebral edema, and coma may occur. Both trivalent and hexavalent chromium have been found to cross the placental barrier in hamsters and mice. Both were shown to enter the fetus during mid to late gestation. Developmental effects caused by both differed between hamster and mice. Fetal uptake of hexavalent chromium was much greater than that of the trivalent form. Effects on placental tissue could have also affected the fetus.
   Ingestion
Gastroenteritis and hemorrhage frequently occur immediately following oral ingestion.
   Inhalation
Pulmonary edema, pneumoconiosis, metal fume fever, and bronchial asthma may occur.
   Skin
Deep perforating ulcers and hypersensitivity dermatitis may be noted. Systemic toxicity has resulted from minimal dermal exposure.
   Eyes
See Inhalation.

First aid
 
   Ingestion
Immediately dilute with 4 to 8 ounces (120 to 240 ml) of milk or water (not to exceed 4 ounces/120 ml in a child). Do not induce vomiting.
   Inhalation
Move victim to fresh air. Apply artificial respiration if victim is not breathing. Do not use mouth-to-mouth method if victim ingested or inhaled the substance; induce artificial respiration with the aid of a pocket mask equipped with a one-way valve or other proper respiratory medical device. Administer oxygen if breathing is difficult.
   Skin
Wash the exposed area with water or 10 to 20 percent ascorbic acid solution for 15 minutes. Consult a physician if irritation or pain persists.
   Eyes
Irrigate exposed eyes with copious amounts of tepid water for at least 15 minutes. If irritation, pain, swelling, lacrimation, or photophobia persist, the patient should be seen in a health care facility.

Transport.
UN number
1564
Response guide
Hazard class
6.1
Packing Group
II; III