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Sodium dichromate

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Name Sodium dichromate EINECS 234-190-3
CAS No. 10588-01-9 Density 2.52 g/cm3
Solubility Melting Point
Formula Na2Cr2O7 Boiling Point
Molecular Weight 261.97 Flash Point
Transport Information 3086 Appearance red or red-orange crystalline solid
Safety 53-45-60-61 Risk Codes 45-46-60-61-8-21-25-26-34-42/43-48/23-50/53
Molecular Structure Molecular Structure of 10588-01-9 (Sodium dichromate) Hazard Symbols VeryT+,DangerousN,OxidizingO
Synonyms

Sodium Bichromate;Chromicacid (H2Cr2O7), sodium salt (1:2);Chromicacid (H2Cr2O7), disodium salt (9CI);Dichromic acid (H2Cr2O7), disodium salt(8CI);Disodium dichromate;Disodium dichromate (Na2Cr2O7);Disodium dichromiumheptaoxide;Sodium chromate (Na2Cr2O7);Sodium dichromate(Na2(Cr2O7));Sodium dichromate(VI);

 

Chemistry

Molecular formula: Na2Cr2O7
Molar mass: 261.97 g/mol
Density 2.52 g/cm3
Melting point: 356.7 °C
Appearance: A red or red-orange crystalline solid
Structure of Sodium dichromate (CAS NO.10588-01-9):
                     
IUPAC Name: Disodium oxido-(oxido(dioxo)chromio)oxy-dioxochromium
Product Category of Sodium dichromate (CAS NO.10588-01-9): Inorganics

Uses

 Sodium dichromate (CAS NO.10588-01-9) is used as the starting material for producing the solutions of chromium salts employed in chrome leather tanning and in chrome mordant dyeing of wool cloth. Pigments, such as yellow lead chromate, are manufactured from sodium dichromate , as also green chromium oxides for ceramic pigments.

Production

 Sodium dichromate (CAS NO.10588-01-9) is manufactured from chromite, a chromium iron oxide containing approximately 50% chromic oxide (Cr2O3) with iron oxide (FeO), alumina (Al2O3), silica (SiO2), and magnesium oxide (MgO). In the process (Fig. 1), the ore is ground and mixed with ground limestone and soda ash, and roasted at approximately 1200 °C in an oxidizing atmosphere. The sintered mass is crushed and leached with hot water to separate the soluble sodium chromate. The solution is treated with sulfuric acid to convert the sodium chromate to sodium dichromate plus sodium sulfate. Some of the sodium sulfate crystallizes in the anhydrous state from the hot solution during acidification as well as in the evaporators during concentration of the dichromate solution. From the evaporator, the hot, saturated dichromate solution is fed to the crystallizer, and then to the centrifuge and dryer.

Toxicity Data With Reference

Organism Test Type Route Reported Dose (Normalized Dose) Effect Source
child LDLo oral 50mg/kg (50mg/kg)   Gekkan Yakuji. Pharmaceuticals Monthly. Vol. 22, Pg. 291, 1980.
child TDLo oral 250mg/kg (250mg/kg) LUNGS, THORAX, OR RESPIRATION: COUGH
GASTROINTESTINAL: NAUSEA OR VOMITING
SKIN AND APPENDAGES (SKIN): SWEATING: OTHER
Australian Paediatric Journal. Vol. 21, Pg. 65, 1985.
frog LDLo intravenous 196mg/kg (196mg/kg)   Archives Internationales de Pharmacodynamie et de Therapie. Vol. 62, Pg. 330, 1939.
guinea pig LDLo intraperitoneal 335mg/kg (335mg/kg)   Archives of Environmental Health. Vol. 11, Pg. 201, 1965.
guinea pig LDLo skin 335mg/kg (335mg/kg)   Archives of Environmental Health. Vol. 11, Pg. 201, 1965.
guinea pig LDLo subcutaneous 23mg/kg (23mg/kg)   "Abdernalden's Handbuch der Biologischen Arbeitsmethoden." Vol. 4, Pg. 1330, 1935.
mouse LDLo intravenous 26200ug/kg (26.2mg/kg)   Environmental Quality and Safety, Supplement. Vol. 1, Pg. 1, 1975.
rabbit LDLo intravenous 18400ug/kg (18.4mg/kg)   Environmental Quality and Safety, Supplement. Vol. 1, Pg. 1, 1975.
rat LD50 oral 50mg/kg (50mg/kg) LIVER: OTHER CHANGES

KIDNEY, URETER, AND BLADDER: OTHER CHANGES
Gigiena Truda i Professional'nye Zabolevaniya. Labor Hygiene and Occupational Diseases. Vol. 22(8), Pg. 38, 1978.
rat LDLo subcutaneous 80mg/kg (80mg/kg)   Toxicologist. Vol. 4, Pg. 75, 1984.

Safety Profile

Confirmed carcinogen with experimental tumorigenic data. Poison by ingestion, skin contact, intravenous, intraperitoneal, and subcutaneous routes. Human systemic effects by ingestion: cough, nausea or vomiting, and sweating. Human mutation data reported. A caustic and irritant. A powerful oxidizer. Potentially explosive reaction with acetic anhydride, ethanol + sulfuric acid + heat, hydrazine. Violent reaction or ignition with boron + silicon (pyrotechnic), organic residues + sulfuric acid, 2-propanol + sulfuric acid, sulfuric acid + trinitrotoluene. Incompatible with hydroxylamine. When heated to decomposition it emits toxic fumes of Na2O. See also CHROMIUM COMPOUNDS.
Hazard Codes: VeryT+ ,DangerousN,OxidizingO
Risk Statements: 45-46-60-61-8-21-25-26-34-42/43-48/23-50/53 
R45:May cause cancer. 
R46:May cause heritable genetic damage. 
R60:May impair fertility. 
R61:May cause harm to the unborn child. 
R8 :Contact with combustible material may cause fire. 
R21:Harmful in contact with skin. 
R25 :Toxic if swallowed. 
R26:Very toxic by inhalation. 
R34:Causes burns. 
R42/43:May cause sensitization by inhalation and skin contact. 
R48:Danger of serious damage to health by prolonged exposure. 
R50/53:Very toxic to aquatic organisms, may cause long-term adverse effects in the aquatic environment.
Safety Statements: 53-45-60-61 
S45:In case of accident or if you feel unwell, seek medical advice immediately (show the label whenever possible.) 
S53:Avoid exposure - obtain special instructions before use. 
S60:This material and its container must be disposed of as hazardous waste. 
S61:Avoid release to the environment. Refer to special instructions / safety data sheets.

Standards and Recommendations

OSHA PEL: CL 0.1 mg/(CrO3)/m3
ACGIH TLV: TWA 0.05 mg(Cr)/m3; Confirmed Human Carcinogen
NIOSH REL: (chromium(VI)): TWA 0.001 mg(Cr)/m3

Analytical Methods

For occupational chemical analysis use NIOSH: Chromium Hexavalent, 7024.

Specification

 Sodium dichromate , its cas register number is 10588-01-9. It also can be called Sodium bichromate ; and Chromic acid (Na2Cr2O7), disodium salt .

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