Overview
Ultra-Low Range COD Reagent is a specialized chemical formulation designed for precise measurement of Chemical Oxygen Demand in samples with minimal organic content. These reagents are optimized for detection ranges typically between 0-50 mg/L, making them essential for monitoring high-purity water systems and lightly contaminated environmental samples. The formulation contains carefully balanced oxidizers, catalysts and masking agents to overcome interference challenges at low concentration levels. Modern versions often incorporate mercury-free chemistry to meet environmental regulations while maintaining analytical performance.
Physical and Chemical Properties
The reagent appears as a clear, slightly viscous liquid with minimal color. Its density is slightly higher than water due to dissolved salts and acid components. The solution is fully miscible with aqueous samples and designed for use in standard COD digestion procedures. Key chemical characteristics include high oxidation potential at low concentrations and built-in interference suppression. The formulation typically combines potassium dichromate (or alternative oxidizers), sulfuric acid, and specialized catalysts that remain effective at trace detection levels. The reagent's stability is temperature-dependent, requiring refrigeration for long-term storage.
Main Applications
Primary applications center around water quality assessment where organic content must be quantified at extremely low levels. This includes monitoring of drinking water sources, pharmaceutical water systems, semiconductor manufacturing effluents, and boiler feed water. The reagent is particularly valuable for regulatory compliance testing where traditional COD methods lack sufficient sensitivity. Environmental labs use it for baseline studies of pristine water bodies, while industrial facilities employ it for process control in ultra-pure water systems. Some advanced wastewater treatment plants utilize low-range COD testing to verify tertiary treatment efficiency.
Safety and Storage
As a strong oxidizing mixture, the reagent requires careful handling with appropriate PPE including acid-resistant gloves, goggles and lab coats. Spills should be neutralized with sodium bicarbonate or commercial absorbents. The solution is corrosive and may release toxic fumes if heated improperly. For storage, amber glass containers are preferred to prevent photochemical degradation. The reagent should be kept refrigerated (2-8°C) with minimal exposure to air to prevent moisture absorption. Unopened vials typically maintain stability for 12-18 months, while opened containers should be used within 3-6 months depending on frequency of use.
B2B Procurement Guide
When sourcing ultra-low range COD reagents, buyers should first confirm compatibility with their existing digestion equipment and photometric analysis methods. Key specifications to verify include the exact measurement range (e.g., 0-50 mg/L vs 0-30 mg/L), chloride interference tolerance, and certification against standard methods. Batch-to-batch consistency is critical, so established manufacturers with rigorous QC processes are preferred. For high-volume users, pre-measured vial formats can improve efficiency and reduce handling risks. Buyers should request stability data and consider purchasing frequency to ensure fresh reagents are always available.
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