Strontium chromate

  • Strontium yellow
Formula
SrCrO4
Structure
Description
Strontium chromate is a light yellow powder or granular solid.
Uses
Corrosion inhibitor in pigments, in electrochemical processes to control sulfate concn of soln.

Registry Numbers and Inventories.
CAS
7789-06-2
EC (EINECS/ELINCS)
232-142-6
EC Index Number
024-009-00-4
EC Class
Carcinogenic Category 2; Harmful; Dangerous for the Environment
RTECS
GB3240000
RTECS class
Tumorigen; Mutagen
UN (DOT)
9149
Merck
12,9001
Beilstein/Gmelin
89144 (G)
RCRA
D007
Swiss Giftliste 1
G-7585
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
CrO4Sr
Formula mass
203.61
Odor Threshold Odor threshold Odorless
Density
3.353 g/cm3 (25 C)
Solubility in water
1.2 g/L

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). Use mechanical dredges or lifts to remove immobilized masses of pollutants and precipitates.
Stability
Trivalent chromium is the most stable oxidation state and hexavalent chromium is the second most stable state. Trivalent, hexavalent chromium.
Incompatibilities
Can react with reducing agents to generate heat and products that may be gaseous (causing pressurization of closed containers) Can react violently with active metals, cyanides, esters, and thiocyanates Avoid contact with water, acids, and bases.

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, except when in presence of heat and organic matter.
Hazards
Heat stable
Combustion products
Fire may produce irritating, corrosive and/or toxic gases.

Health.
Exposure limit(s)
TLV: ppm; 0.0005 mg/m3 Intended change A2: as Cr (ACGIH 1991-1992).
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
Induce vomiting, give demulcents and fluids.
   Inhalation
Remove to fresh air.
   Skin
Wash thoroughly with soap and water.
   Eyes
Irrigate with running water for 15 minutes. Consult a physician.

Transport.
UN number
9149
Response guide
Hazard class
6.1
USCG CHRIS Code
SCM
 
Std. Transport #
4963377