Wholesale Automatic COD Analyzer Wholesaler & Manufacturers

Chloride ions (Cl⁻) represent the most frequent source of positive bias in dichromate digestion because they are readily oxidized by K₂Cr₂O₇. BOQU automatic analyzers integrate an automated masking module utilizing mercuric sulfate (HgSO₄) in a standardized 10:1 ratio relative to Cl⁻ concentration, suppressing interference up to 5,000 mg/L Cl⁻. For coastal desalination brine or specialized industrial streams exceeding this limit, automated silver nitrate precipitation modules or dilution pathways are deployed.

Under regular industrial cycles (1 test per hour), reagent replenishment occurs at 30-day intervals. BOQU analyzers utilize high-precision micro-metering syringe pumps that reduce reagent fluid consumption by 40% compared to traditional peristaltic digestion machines. Routine maintenance involves auto-zero baseline calibration every 24 hours, automated tube cleanout with nitric wash, and quarterly peristaltic tubing replacement.

Yes. Shanghai BOQU Instrument operates dedicated sheet metal fabrication, SMT surface-mount electronics assembly, and software engineering teams. We supply Tier-1 global process integrators with custom IP65/NEMA 4X enclosures, customized UI firmware, Modbus-TCP / Profibus-DP communication expansions, and specialized optical paths optimized for proprietary parameters.

COD-Cr utilizes potassium dichromate in strong sulfuric acid at 165°C, yielding strong oxidative efficiency (>90% of complex organics), and serves as the global standard for industrial wastewater discharge compliance. COD-Mn (Permanganate Index) uses potassium permanganate, reflecting an oxidation efficiency of 40-50%, and is predominantly specified for drinking water reservoirs, surface clean streams, and low-turbidity environmental basins.

BOQU systems employ a dynamic cross-flow filtration or maceration sampling unit mounted at the intake channel. The subsystem shears heavy suspended particles to avoid blockages within the internal capillary channels while ensuring the sample remains representative of the total organic discharge, preventing localized floc settling from skewing absorption metrics.