Calcium chromate

  • Calcium chromate(VI)
  • Calcium chrome yellow
Formula
CaCrO4
Structure
Description
Calcium chromate is a yellow powder. (© AAR, 1999.
Uses
As pigment, manufacture of chromium, in oxidizing reactions.

Registry Numbers and Inventories.
CAS
13765-19-0
EC (EINECS/ELINCS)
237-366-8
EC Index Number
024-008-00-9
EC Class
Carcinogenic Category 2; Harmful; Dangerous for the Environment
RTECS
GB2750000
RTECS class
Tumorigen; Mutagen; Reproductive Effector
UN (DOT)
9096
Merck
12,1700
Beilstein/Gmelin
22190 (G)
RCRA
U032
Swiss Giftliste 1
G-6528
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
CaCrO4
Formula mass
156.07
Melting point, °C
2170
Odor Threshold Odor threshold Odorless
Density
3.12 g/cm3 (20 C)
Solubility in water
< 0.1 g/L
Thermal expansion
0.93/K

Hazards and Protection.
Storage
Keep containers tightly closed in a well ventilated area away from food products. Keep away from heat and water.
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
Keep material out of water sources and sewers. Build dikes to contain flow as necessary. Land spill: Dig a pit, pond, lagoon, holding area to contain liquid or solid material. Cover solids with a plastic sheet to prevent dissolving in rain or fire fighting water. Water spill: Add sodium bisulfite (NaHSO3). Neutralize with agricultural lime (CaO), crushed limestone (CaCO3), or sodium bicarbonate (NaHCO3). Adjust pH to neutral (pH=7). Use mechanical dredges or lifts to remove immobilized masses of pollutants and precipitates.
Stability
Stable material trivalent chromium is the most stable oxidation state and hexavalent chromium is the second most stable state.
Incompatibilities
Reacts with acids and ethanol.

Fire.
Fire fighting
Extinguish fire using agent suitable for type of surrounding fire. (Material itself does not burn or burns with difficulty.)
Fire potential
Nonflammable.
Hazards
Containers may explode when heated.
Combustion products
Toxic chromium fume may be formed in fires.

Health.
Exposure limit(s)
TLV: 0.025 ppm; 0.16 mg/m3 (ACGIH 1991-1992). NIOSH REL: Ca 0.001 mg Cr(VI)/m3 See Appendix A See Appendix C NIOSH IDLH: Potential occupational carcinogen
Carcinogin
G-A2, I-1, N-1, CP65
Poison_Class
1*
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
Oral burns and severe corneal injury may result from acute exposure. Chronic inhalation produces deep perforating nasal ulcers (chrome holes).

First aid
 
   Ingestion
Seek medical assistance.
   Inhalation
IMMEDIATELY leave the contaminated area; take deep breaths of fresh air. IMMEDIATELY call a physician and be prepared to transport the victim to a hospital even if no symptoms (such as wheezing, coughing, shortness of breath, or burning in the mouth, throat, or chest) develop. Provide proper respiratory protection to rescuers entering an unknown atmosphere. Whenever possible, Self-Contained Breathing Apparatus (SCBA) should be used.
   Skin
IMMEDIATELY flood affected skin with water while removing and isolating all contaminated clothing. Gently wash all affected skin areas thoroughly with soap and water. IMMEDIATELY call a hospital or poison control center even if no symptoms (such as redness or irritation) develop. IMMEDIATELY transport the victim to a hospital for treatment after washing the affected areas.
   Eyes
First check the victim for contact lenses and remove if present. Flush victim's eyes with water or normal saline solution for 20 to 30 minutes while simultaneously calling a hospital or poison control center. Do not put any ointments, oils, or medication in the victim's eyes without specific instructions from a physician. IMMEDIATELY transport the victim after flushing eyes to a hospital even if no symptoms (such as redness or irritation) develop.

Transport.
UN number
9096
Response guide
Hazard class
6.1
USCG CHRIS Code
CCR
 
Std. Transport #
4962629