Sodium chromate

Formula
Na2CrO4
Structure
Description
A yellow crystalline solid.
Uses
Chemical intermediate for pigments, eg, strontium chromate, corrosion inhibitor in circulating water systems, metal treatment (eg, for chemical conversion coatings), mordant for dyes, drilling mud additive, chemical intermediate for chromium catalysts, component of cells for chlorate manufacture.

Registry Numbers and Inventories.
CAS
7775-11-3
EC (EINECS/ELINCS)
231-889-5
EC Index Number
024-018-00-3
EC Class
Carcinogenic Category 2; Mutagenic Category 2; Very toxic; Toxic; Harmful; Irritant; Sensitising; Dangerous for the Environment
R 49 46 21 25 26 37/38 41 43 50/53
S 53 45 60 61
RTECS
GB2955000
RTECS class
Tumorigen; Mutagen; Reproductive Effector
UN (DOT)
9145
Merck
12,8745
Beilstein/Gmelin
23023 (G)
RCRA
D007
EPA OPP
68303
Swiss Giftliste 1
G-2582
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
CrNa2O4
Formula mass
161.97
Melting point, °C
780
Density
2.698 g/cm3
Solubility in water
870 g/L

Hazards and Protection.
Storage
Store in a tightly closed container. Store in a cool, dry, well-ventilated area away from incompatible substances.
Handling
Wash thoroughly after handling. Remove contaminated clothing and wash before reuse. Use only in a well ventilated area. Do not get in eyes, on skin, or on clothing. Do not ingest or inhale. Discard contaminated shoes.
Protection
Eyes: Wear appropriate protective eyeglasses or chemical safety goggles as described by OSHA's eye and face protection regulations in 29 CFR 1910.133 or European Standard EN166. Skin: Wear appropriate protective gloves to prevent skin exposure. Clothing: Wear appropriate protective clothing to prevent skin exposure.
Respirators
Follow the OSHA respirator regulations found in 29CFR 1910.134 or European Standard EN 149. Always use a NIOSH or European Standard EN 149 approved respirator when necessary.
Small spills/leaks
Vacuum or sweep up material and place into a suitable disposal container. Avoid generating dusty conditions.
Stability
Stable under normal temperatures and pressures.
Incompatibilities
Keep away from combustible materials. may casue a fire. Under certain conditions, dry mixtures of chromates with azo-dyes may lead to violent explosions during mixing or blending operations. Hydrazine is decomposed explosively by chromates.
Decomposition
Toxic fumes of sodium oxide, toxic chromium oxide fumes.

Fire.
Fire fighting
Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. Extinguishing media: For small fires, use dry chemical, carbon dioxide, water spray or alcohol-resistant foam.
Fire potential
Non-combustible it can react with combustible materials and the heat of this reaction may be sufficient to result in the ignition of the combustible material.
Hazards
Behavior in fire: May increase intensity of fire when in contact with combustible material.
Combustion products
Toxic chromium oxide fumes may form in fire.
Health
3
 
Special
O

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-A1, I-1, N-1, CP65
Poison_Class
1*
Exposure effects
Prolonged or repeated eye contact may cause conjunctivitis. Prolonged or repeated skin contact may cause sensitization dermatitis and possible destruction and/or ulceration. Prolonged or repeated exposure may lead to asthma and perforation of the nasal septum. Prolonged or repeated contact may cause skin necrosis and/or ulceration of the skin. May cause cancer in humans. Chronic exposure may cause acute hepatitis with jaundice.
   Ingestion
May be fatal if swallowed. May cause severe gastrointestinal tract irritation with nausea, vomiting and possible burns. May cause liver and kidney damage. May cause perforation of the digestive tract. May cause hemorrhaging of the digestive tract.
   Inhalation
Causes respiratory tract irritation. May cause ulceration and perforation of the nasal septum if inhaled in excessive quantities.
   Skin
May cause skin sensitization, an allergic reaction, which becomes evident upon re-exposure to this material. May cause deep, penetrating ulcers of the skin. May be absorbed through the skin. May cause severe irritation and possible burns.
   Eyes
Contact with eyes may cause severe irritation, and possible eye burns.

First aid
 
   Ingestion
Do NOT induce vomiting. If victim is conscious and alert, give 2-4 cupfuls of milk or water. Never give anything by mouth to an unconscious person. Get medical aid immediately.
   Inhalation
Get medical aid immediately. Remove from exposure to fresh air immediately. If not breathing, give artificial respiration. If breathing is difficult, give oxygen.
   Skin
Get medical aid immediately. Immediately flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes.
   Eyes
Immediately flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. Get medical aid immediately.

Transport.
UN number
9145
Response guide
Hazard class
5.1
Packing Group
II
 
USCG CHRIS Code
SCH
 
Std. Transport #
4925236