Overview
COD Reagent AR Grade is a standardized chemical solution for determining Chemical Oxygen Demand (COD) in water samples through dichromate oxidation. As an Analytical Reagent (AR) grade product, it meets strict purity standards (typically ≥99% active components) with controlled impurity levels to ensure measurement accuracy. The reagent typically contains potassium dichromate (K₂Cr₂O₇) as the oxidizing agent, sulfuric acid as the reaction medium, and silver sulfate as a catalyst. AR grade distinguishes it from technical-grade reagents by guaranteeing minimal interference from contaminants like chloride ions, which is critical for precise environmental testing.
Physical and Chemical Properties
The reagent's oxidation potential derives from dichromate ions (Cr₂O₇²⁻) in acidic medium, capable of converting most organic compounds to CO₂ and H₂O at 150°C. Its standard oxidation capacity is 0.25-0.30 g O₂/g dichromate, with a shelf life extending up to 18 months when refrigerated. Key quality indicators include consistent blank values (<5 mg/L COD equivalent), mercury content (<0.1 ppm for eco-friendly formulations), and batch-to-batch variation under 2%. The solution maintains stability across pH <2 but decomposes in alkaline conditions or prolonged UV exposure.
Main Applications
Primary use cases include wastewater treatment plant monitoring (influent/effluent testing), industrial discharge compliance (EPA Method 410.4), and research studies on organic pollution. The AR grade is mandatory for regulatory reporting where ±5% measurement accuracy is required. Industries with heavy utilization include pharmaceuticals (cleaning validation), food processing (BOD:COD ratio analysis), and petrochemicals (refinery wastewater characterization). Some advanced formulations incorporate chloride masking agents for high-salinity samples common in coastal areas.
Safety and Storage
As a Category 1 carcinogen (hexavalent chromium content), the reagent demands strict handling protocols: acid-resistant gloves (≥0.4mm neoprene), splash goggles, and secondary containment. Spill kits must contain reducing agents (e.g., sodium thiosulfate) to detoxify chromium(VI). Storage requires dedicated refrigerators labeled for hazardous chemicals, ideally with pH/ORP monitoring. Partially used bottles should be purged with argon before resealing to prevent oxidation state changes. Waste disposal must comply with local regulations for heavy metal-contaminated acids.
B2B Procurement Guide
Industrial buyers should prioritize suppliers with GMP certification and COA including: 1) Actual vs. theoretical COD equivalence, 2) Mercury-free certification (for ISO 14001 compliance), and 3) Stability data under accelerated aging tests. Bulk procurement (≥200L) typically offers 15-30% cost savings but requires verification of cold chain logistics. Consider prepacked vials for field testing to minimize handling risks. Emerging alternatives include stabilized COD reagents with 2-year room temperature stability, though at 20-40% price premium.
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