Overview
Chemical Oxygen Demand (COD) powder is a pre-formulated reagent designed to simplify the measurement of organic pollutants in water. It typically contains potassium dichromate (or alternative oxidants), sulfuric acid, and catalysts like silver sulfate. The powder form ensures consistent dosing and reduces handling risks compared to liquid reagents. Widely used in laboratories and industrial settings, COD powder enables rapid assessment of water quality by quantifying the oxygen required to chemically oxidize organic matter. This metric is critical for compliance with environmental regulations and optimizing wastewater treatment processes.
Physical and Chemical Properties
COD powder formulations vary but generally exhibit high oxidative strength due to their acidic and catalytic components. The powder dissolves exothermically in water, producing a reactive solution that oxidizes organic compounds at elevated temperatures (typically 150°C in reflux systems). Key chemical properties include a high redox potential (~1.3V) and stability under controlled storage. Physical characteristics like particle size (usually 50-200 microns) affect dissolution rates and testing reproducibility. Some modern formulations use eco-friendly oxidants to reduce hazardous waste generation.
Main Applications
The primary use of COD powder is in standardized water quality testing (e.g., ISO 6060, EPA 410.4). Municipal wastewater plants employ it for discharge monitoring, while industries (food processing, pharmaceuticals, textiles) utilize it for effluent control. Beyond compliance, COD testing aids in process optimization—for example, tracking biodegradation efficiency in anaerobic digesters. Specialized low-range powders are available for clean water analysis, while high-range variants suit industrial wastewater with concentrated organics.
Safety and Storage
COD powder requires strict safety protocols due to its corrosive and toxic components. Storage must prevent moisture absorption (which can degrade performance) and isolate the reagent from organic materials to avoid unintended reactions. Spill management should neutralize acids with bases (e.g., sodium bicarbonate) and collect residues for hazardous waste disposal. Users must follow local regulations for handling chromate-containing materials, including proper labeling and employee training.
B2B Procurement Guide
When sourcing COD powder, buyers should verify the reagent’s measurement range (e.g., 0-1,500 mg/L or 0-15,000 mg/L COD), certification (e.g., ISO 6060 compliance), and batch consistency. Bulk purchases (25+ kg) often reduce costs but require validated shelf-life data. Supplier evaluation should include testing support (e.g., method documentation) and packaging options (sealed vials vs. bulk drums). For sustainability-focused operations, mercury-free or low-hazard formulations are increasingly available at a premium.
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