sodium dichloromate

Product Overview

Sodium dichloromate, commonly referred to as sodium dichromate and sodium dichromate dihydrate, is a high-purity, powerful oxidizing agent supplied as a yellow crystalline solid. The product is supplied as a dihydrate, enabling precise control of oxidizing potential in both synthesis and analytical workflows. It serves as a source of dichromate ions in chemical reactions, providing reliable oxidizing strength under controlled conditions and enabling robust performance in laboratory analytical chemistry, industrial synthesis, and manufacturing processes. The material is produced to meet ACS Reagent Grade specifications and USP-NF monograph requirements, ensuring compatibility with rigorous quality systems and analytical methods.

In addition to its primary oxidizing function, this sodium dichromate product is commonly used in water treatment and electroplating baths, where precise oxidant delivery, trace impurity control, and compatibility with downstream processes are critical. The product’s specifications emphasize low impurity levels and consistent batch-to-batch performance, with tight controls on moisture content, chloride and heavy metal levels, and residue after ignition. When handled under proper storage and safety protocols, it provides dependable performance for industrial and analytical applications requiring chromate-based oxidizing chemistry.

Key Properties

• Appearance: Yellow crystalline solid
• Chemical Formula: Na₂Cr₂O₇·2H₂O
• Molecular Weight: 322.18 g/mol
• CAS: 10588-01-9
• Solubility: Soluble in water
• Specific Gravity (20°C): 1.9–2.1 (typical 2.0)
• Residue After Ignition: Max 0.1% (typical 0.05%)
• Chloride (Cl): Max 200 ppm (typical 50 ppm)
• Nitrate (NO₃⁻): Max 100 ppm (typical 20 ppm)
• Ammonium (NH₄⁺): Max 50 ppm (typical 10 ppm)
• Sulfate (SO₄²⁻): Max 100 ppm (typical 25 ppm)
• Phosphate (PO₄³⁻): Max 40 ppm (typical 5 ppm)
• Arsenic (As): Max 0.2 ppm (typical 0.05 ppm)
• Heavy Metals (as Pb): Max 0.5 ppm (typical 0.1 ppm)
• Iron (Fe): Max 5 ppm (typical 1 ppm)
• Copper (Cu): Max 2 ppm (typical 0.5 ppm)
• Manganese (Mn): Max 3 ppm (typical 0.5 ppm)
• Nickel (Ni): Max 2 ppm (typical 0.5 ppm)
• Chromium (Cr): Max 10 ppm (typical 2 ppm)
• Sodium (Na): Max 20 ppm (typical 5 ppm)
• Potassium (K): Max 20 ppm (typical 5 ppm)
• Water Content: Max 0.5% (typical 0.1%)
• Acidity (Meq): Max 0.2 (typical 0.05)

Common Applications

• Oxidizing Agent: Chemical Manufacturing — Provides strong oxidizing power for diverse organic and inorganic transformations under controlled conditions, with reliable stoichiometry and compatibility with downstream processing.
• Analytical Reagent: Laboratory — Used in quantitative analyses and titrations where chromate-based oxidants are required, supported by validated assay methods and trace impurity control.
• Water Treatment: Environmental — Employed in controlled oxidation steps to remove contaminants; requires careful dosing and corrosion-control considerations in treatment systems.
• Electroplating: Manufacturing — Serves as a chromium source in electroplating baths, enabling stable chromium deposition with attention to bath composition and impurity management.
• Dye Manufacturing: Textiles — Acts as a mordant or oxidizing component in dyeing processes, facilitating color development and fixation with compatible process chemistries.

Safety Precautions

Handling, storage, and protective equipment should align with the product’s SDS and applicable regulations. Store in a cool, dry place away from incompatible materials, using HDPE or glass containers to preserve integrity. Protect packaging from moisture and light; maintain adequate ventilation in storage and handling areas. PPE should include chemical-resistant gloves, splash goggles, and lab coat or apron to prevent skin and eye contact during weighing, transfer, and dissolution steps.

In addition to basic handling practices, observe exposure controls and emergency procedures. The product is a recognized oxidizer with hazard statements indicating potential corrosivity and toxicity on ingestion or contact. Rinse exposed skin or eyes immediately, remove contaminated clothing, and seek medical attention if exposure occurs. If inhaled, move to fresh air and seek medical evaluation if symptoms appear. In case of spillage, evacuate area, contain with inert absorbent material, and dispose of residues per local, state, and federal regulations. This material is classified under UN 3284 for transport; follow appropriate packaging and labeling requirements and consult the SDS for detailed emergency response steps.

Benefits

✔ High Purity and Consistent Quality – ACS Reagent Grade and USP-NF compliance support reliable performance across analytical and manufacturing workflows.
✔ Controlled Impurity Profile – Stringent specification limits for heavy metals, chlorides, and nitrate help minimize interference in sensitive assays and electrochemical processes.