Disodium;dioxido(dioxo)chromium

CrNa2O4

disodium;dioxido(dioxo)chromium

CAS7775-11-3
GHS08 Gefahrensymbol: Gesundheitsgefahr – Gesundheitsgefahr
GHS06 Gefahrensymbol: Giftig – Totenkopf mit Knochen
GHS05 Gefahrensymbol: Ätzend – Ätzwirkung
GHS09 Gefahrensymbol: Umweltgefährlich – Umwelt
Danger

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Identification

CAS Number
7775-11-3
EC Number
231-889-5
UN Number
3290
Index Number
024-018-00-3
PubChem CID
24488

Physical-chemical properties

Molecular Formula
CrNa2O4
Molar Mass
161.97 g/mol
IUPAC Name
disodium;dioxido(dioxo)chromium

Chemical Identifiers

InChI
InChI=1S/Cr.2Na.4O/q;2*+1;;;2*-1
InChI Key
PXLIDIMHPNPGMH-UHFFFAOYSA-N

Overview

Disodium dioxido(dioxo)chromium (CAS 7775-11-3) is an inorganic chromium compound with strong oxidizing properties and high toxicity profile. This sodium chromate compound, with the molecular formula CrNa2O4 and a molecular weight of 161.973 g/mol, represents one of the most regulated chromium-based chemicals in industrial applications. Also identified by EC number 231-889-5, this yellow crystalline solid contains hexavalent chromium, which accounts for its significant hazard classification and stringent handling requirements across European markets. The compound exhibits exceptional oxidizing capabilities, making it valuable in specific industrial processes while simultaneously presenting serious health and environmental concerns. Its hazard profile includes carcinogenic, mutagenic, and reproductive toxicity properties (Carc. 1B, Muta. 1B, Repr. 1B), along with acute toxicity classifications and specific target organ toxicity. The presence of multiple GHS pictograms (GHS08, GHS06, GHS05, GHS09) and ADR class 6.1 classification underscores the need for specialized handling protocols and appropriate safety measures. Primary industrial applications include metal surface treatment processes, particularly in chromium plating operations and corrosion inhibition systems. The compound also serves as a chemical intermediate in the synthesis of other chromium compounds and as an analytical reagent in laboratory applications. Unlike less hazardous alternatives such as 2,2-dibromo-2-cyanoacetamide used in water treatment, sodium chromate requires extensive safety infrastructure and regulatory compliance. Given its regulatory complexity and the specialized nature of chromium chemistry, proper technical support and documentation are essential for safe handling and application. OYSI provides comprehensive technical guidance and regulatory support for qualified industrial customers requiring this specialized chromium compound.

Safety & Classification

Danger
Classification:

Carc. 1B; Muta. 1B; Repr. 1B; Acute Tox. 2 *; Acute Tox. 4 *; Acute Tox. 3 *; STOT RE 1; Skin Cor...

HHazard Statements (H-Statements)

Describe the nature and severity of the hazard

H350

May cause cancer.

H340

May cause genetic defects.

H330

Fatal if inhaled.

H312

Harmful in contact with skin.

H301

Toxic if swallowed.

H372

Causes damage to organs through prolonged or repeated exposure.

H314

Causes severe skin burns and eye damage.

H334

May cause allergy or asthma symptoms or breathing difficulties if inhaled.

H317

May cause an allergic skin reaction.

H400

Very toxic to aquatic life.

H410

Very toxic to aquatic life with long lasting effects.

Classification according to CLP Regulation (EC) No 1272/2008. The complete list of hazard and precautionary statements can be found in the Safety Data Sheet (SDS).

First Aid Measures

Inhalation

Fatal

Measures if vapours or dust are inhaled

First Aid Actions

  • +P304IF INHALED:
  • +P340Remove person to fresh air and keep comfortable for breathing.
  • +P311Call a POISON CENTER/doctor.

Related hazard statements:

Skin Contact

Harmful

Measures if substance contacts the skin

First Aid Actions

  • +P302IF ON SKIN:
  • +P352Wash with plenty of water.
  • +P361Take off immediately all contaminated clothing.
  • +P313Get medical advice/attention.

Related hazard statements:

Eye Contact

Harmful

Measures if substance gets into the eyes

First Aid Actions

  • +P305IF IN EYES:
  • +P351Rinse cautiously with water for several minutes.
  • +P338Remove contact lenses, if present and easy to do. Continue rinsing.
  • +P313Get medical advice/attention.

Related hazard statements:

Ingestion

Toxic

Measures if substance is accidentally swallowed

First Aid Actions

  • +P301IF SWALLOWED:
  • +P330Rinse mouth.
  • +P331Do NOT induce vomiting.
  • +P310Immediately call a POISON CENTER/doctor.

Related hazard statements:

General Measures

Emergency 112 | Poison Control: +49 30 19240 (DE), +33 1 45 42 59 59 (FR), +31 30 274 88 88 (NL)

First aid measures are based on CLP classification and associated P-statements. They do not replace the Safety Data Sheet (SDS). In case of emergency, always consult the full SDS and a physician.

Transport (ADR)

UN Number3290
ADR Class6.1
Packing GroupII
Tunnel CodeD/E
Proper Shipping NameNatriumchromat
Marine PollutantNo

Frequently Asked Questions

What is disodium;dioxido(dioxo)chromium?

Disodium;dioxido(dioxo)chromium is an inorganic chromium compound with the chemical formula CrNa2O4 and molecular weight of 161.973 g/mol. Also known as sodium chromate, this substance contains hexavalent chromium and appears as a yellow crystalline solid. It is classified as extremely hazardous with carcinogenic, mutagenic, and reproductive toxicity properties, requiring strict safety protocols during handling and use.

What are the physicochemical properties of disodium;dioxido(dioxo)chromium?

Disodium;dioxido(dioxo)chromium is a yellow crystalline solid that is highly soluble in water, forming alkaline solutions. The compound is odorless and has a molecular weight of 161.973 g/mol. It exhibits strong oxidizing properties due to the presence of hexavalent chromium. The substance is hygroscopic, meaning it readily absorbs moisture from air, and decomposes at high temperatures.

What is disodium;dioxido(dioxo)chromium used for?

Disodium;dioxido(dioxo)chromium is primarily used in metal treatment processes, particularly for corrosion protection and passivation of aluminum and other metals. It serves as a raw material in the production of other chromium compounds and pigments. The substance is also utilized in electroplating processes and as an oxidizing agent in various chemical syntheses, though its use is increasingly restricted due to health concerns.

How to handle disodium;dioxido(dioxo)chromium safely?

Disodium;dioxido(dioxo)chromium requires extreme caution during handling due to its carcinogenic and toxic properties. Essential protective equipment includes chemical-resistant gloves, safety goggles, respiratory protection, and protective clothing. Work must be conducted in well-ventilated areas or under fume extraction. Avoid skin contact, inhalation, and ingestion. All personnel must receive proper training on chromate handling procedures before working with this substance.

How to store disodium;dioxido(dioxo)chromium correctly?

Disodium;dioxido(dioxo)chromium must be stored in tightly sealed containers in a cool, dry, well-ventilated area away from incompatible materials. Keep away from reducing agents, organic materials, and acids to prevent dangerous reactions. Storage areas should be equipped with appropriate containment measures and restricted access. Containers should be labeled according to CLP requirements and stored in secondary containment systems.

What to do in case of contact with disodium;dioxido(dioxo)chromium?

Disodium;dioxido(dioxo)chromium exposure requires immediate emergency response. For skin contact, immediately flush with copious amounts of water for at least 15 minutes and remove contaminated clothing. If inhaled, move to fresh air and seek medical attention. For eye contact, rinse thoroughly with water for 15 minutes. In case of ingestion, do not induce vomiting and seek immediate medical attention. Always consult a physician after any exposure.

How to dispose of disodium;dioxido(dioxo)chromium properly?

Disodium;dioxido(dioxo)chromium must be disposed of as hazardous waste through licensed waste management companies specializing in toxic materials. The substance cannot be discharged to sewers or the environment due to its carcinogenic properties and environmental toxicity. Disposal must comply with local, national, and EU waste regulations. Containers should be triple-rinsed and treated as contaminated waste requiring proper disposal procedures.

How to transport disodium;dioxido(dioxo)chromium?

Disodium;dioxido(dioxo)chromium is classified under ADR as Class 6.1 (toxic substances), Packing Group II, indicating high toxicity requiring strict transport regulations. Packages must bear appropriate hazard labels and be transported by certified carriers trained in dangerous goods handling. Proper documentation including transport documents and emergency response information must accompany shipments. Vehicles must be equipped with appropriate emergency equipment.

Is disodium;dioxido(dioxo)chromium subject to specific regulations?

Disodium;dioxido(dioxo)chromium is subject to extensive regulation under REACH, CLP, and various EU directives due to its carcinogenic, mutagenic, and reproductive toxicity properties. The substance requires registration under REACH and may face authorization requirements. Use is restricted in consumer products and requires occupational exposure limits compliance. Companies must maintain detailed safety data sheets and implement risk management measures according to regulatory requirements.

Where to buy disodium;dioxido(dioxo)chromium in Europe?

Disodium;dioxido(dioxo)chromium is available through OYSI, a specialized European distributor of technical chemicals with expertise in hazardous materials handling. As a professional chemical supplier, OYSI ensures proper packaging, documentation, and regulatory compliance for this restricted substance. Purchase requires verification of legitimate industrial use and appropriate safety infrastructure. Contact OYSI's technical team for availability, specifications, and regulatory guidance for your specific application requirements.

Data Sources

Classification per CLP Regulation (EC) No 1272/2008. Data from ECHA and PubChem.