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        Sodium dichromate

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        Sodium dichromate

        EINECS 234-190-3
        CAS No. 10588-01-9 Density 2.52 g/cm3
        Solubility Melting Point 356.7oC
        Formula Na2Cr2O7 Boiling Point 250-251°C(lit.)
        Molecular Weight 261.97 Flash Point >230°F
        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);

         

        Sodium dichromate Chemical Properties

        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

        Sodium dichromate 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.

        Sodium dichromate 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.

        Sodium dichromate 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.

        Sodium dichromate 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.

        Sodium dichromate 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

        Sodium dichromate Analytical Methods

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

        Sodium dichromate 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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