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Sodium Dichromate Extra Pure

Original price was: $ 19.11.Current price is: $ 18.98.

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Sodium Dichromate Extra Pure is a powerful oxidizing agent presented as a bright orange crystalline solid, extensively used in analytical chemistry, electroplating, pigment manufacture, and metal surface treatment. Known for its high chemical reactivity and strong acidity, it is a critical compound in redox reactions and in the synthesis of various chromium-containing intermediates. Due to the presence of hexavalent chromium (Cr⁶⁺), it poses significant health and environmental hazards, including carcinogenicity, and is tightly regulated across industries. The Extra Pure grade ensures high assay value, consistent reactivity, and suitability for trace analytical applications under controlled conditions.

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Categories: Analytical Reagents, Laboratory Safety Chemicals Tags: AnalyticalReagent, ChromiumCompound, ElectroplatingAgent, ExtraPure, HexavalentChromium, OxidizingAgent, RedoxReagent, SodiumDichromate, ToxicChemical

Description

Table of Contents

Sodium Dichromate Extra Pure

PRIMARY USES

Analytical Reagent & Laboratory Applications:
Used as a strong oxidizing agent in volumetric and redox titrations
• Functions in preparation of reference standards for chromium analysis
• Applied in trace metal detection and speciation in analytical chemistry
• Serves as a source of hexavalent chromium in controlled lab experiments
Pigment & Dye Manufacturing:
Precursor for producing chrome-based pigments (e.g., chrome yellow, chrome green)
• Acts as a mordant in textile dyeing to enhance color fixation and durability
Electroplating & Surface Treatment:
Employed in chrome plating baths and passivation of metals
• Used in anodizing aluminum and corrosion-resistant coatings
• Facilitates etching and surface preparation for plastics and metals

SECONDARY USES

Leather Industry:
Utilized in tanning processes to crosslink collagen fibers and produce durable leather
• Offers high resistance to microbial decay and environmental degradation
Glass & Ceramics:
Used to impart a yellow-to-orange coloration in specialty glass
• Acts as a colorant and fluxing agent in ceramic glazes
Wood Preservation:
Applied in formulations for protecting wood from fungi and insect damage (now highly restricted)

KEY PRODUCT FEATURES

1. Basic Identification Attributes

Chemical Name: Sodium Dichromate
• CAS Number: 10588-01-9 (dihydrate), 7789-12-0 (anhydrous)
• HS Code: 2841.30.00
• Molecular Formula: Na₂Cr₂O₇·2H₂O (for dihydrate)
• Synonyms:

Disodium dichromate
Sodium bichromate
Dichromic acid, disodium salt
Chromic acid disodium salt

2. Physical & Chemical Properties

Physical State: Solid (crystalline or granular)
• Color & Odor: Bright orange to reddish-orange, odorless
• Melting Point: 356 °C (anhydrous, decomposes)
• Density/Specific Gravity: ~2.52 g/cm³ (dihydrate)
• Solubility:

Highly soluble in water (~73 g/100 mL at 20 °C)
Insoluble in alcohol and organic solvents
• pH Level: Acidic (~4.0 in 1% aqueous solution)
• Oxidizing Properties: Strong oxidizer
• Vapor Pressure & Volatility: Negligible volatility
• Flash Point: Not flammable

3. Safety & Hazard Attributes

Hazard Class (GHS Classification):

Carcinogenicity (Category 1B)
Acute toxicity – oral/inhalation (Category 3)
Skin corrosion (Category 1B)
Eye damage (Category 1)
Germ cell mutagenicity (Category 1B)
Respiratory sensitization (Category 1)
Aquatic toxicity – acute and chronic (Category 1)
• NFPA Ratings:
Health: 4
Flammability: 0
Reactivity: 1
• Exposure Limits:
OSHA PEL: 0.005 mg/m³ (as Cr(VI))
ACGIH TLV: 0.05 mg/m³ (as Cr(VI), TWA)
• Reactivity:
Reactive with organic materials, reducing agents, and acids
Releases toxic chromium fumes when heated

4. Storage & Handling Attributes

Storage Conditions:

Store in a tightly sealed container in a cool, dry, well-ventilated area
Avoid exposure to direct sunlight, heat, or moisture
• Incompatible Materials:
Organic substances, reducing agents, acids, ammonium salts
• Container Type:
Corrosion-resistant or plastic-lined containers
• Shelf Life & Expiration Date:
Stable if kept dry and uncontaminated
• Special Handling Requirements:
Use only with appropriate PPE
Avoid generating dust
Handle under fume hood in controlled environments

5. Regulatory & Compliance Attributes

Regulatory Status:

Strictly regulated due to hexavalent chromium content
Listed under REACH SVHC and U.S. EPA hazardous substances
Subject to OSHA Hexavalent Chromium Standards (29 CFR 1910.1026)
• Transportation Restrictions:
Regulated as a hazardous material (UN 3288 – Toxic Solid, Inorganic, N.O.S.)
• Waste Disposal Method:
Dispose through licensed hazardous waste disposal services
Must not be disposed of in general wastewater systems

6. Environmental & Health Impact

Ecotoxicity:

Highly toxic to aquatic organisms
Persistent in aquatic and soil environments
• Persistence in Environment:
Cr(VI) compounds do not degrade readily and pose long-term environmental risk
• Carcinogenicity/Mutagenicity:
Classified as a known human carcinogen by IARC, NTP, and OSHA
Capable of causing genetic mutations and reproductive toxicity
• Biodegradability:
Inorganic and not biodegradable
Requires chemical reduction to less toxic Cr(III) form before disposal

SAFETY HANDLING PRECAUTIONS

SAFETY PRECAUTIONS

Personal Protective Equipment (PPE):
• Wear heavy-duty chemical-resistant gloves (e.g., nitrile, neoprene)
• Use full-seal safety goggles or face shield
• Wear lab coat and chemical-resistant apron or clothing
• Use an approved respirator (HEPA or supplied air) when dust is present

Handling:
• Always work under a fume hood
• Avoid dust generation and direct skin or eye contact
• Do not eat, drink, or smoke in areas where this chemical is handled
• Wash hands thoroughly after handling

Storage:
• Store away from incompatible and combustible materials
• Use secondary containment where feasible
• Clearly label containers with hazard warnings