Overview
40g/L sodium hypochlorite solution is a standardized concentration of bleach commonly used in industrial and municipal applications. The 4% active chlorine content makes it effective for disinfection while remaining relatively stable compared to higher concentrations. This solution is produced by diluting commercial-grade (typically 12-15%) sodium hypochlorite with demineralized water. As a chlorine-based compound, it has been used for over a century in sanitation systems. The 40g/L concentration offers optimal balance between efficacy and safety for most water treatment and surface disinfection applications. It's widely specified in public health protocols and industrial cleaning procedures.
Physical and Chemical Properties
The solution appears as a clear, slightly yellow liquid with characteristic chlorine odor. It has a pH of 11-13 in concentrated form, decreasing upon dilution. The hypochlorite ion (ClO-) is responsible for its oxidative properties, with a redox potential of +0.89V. This solution decomposes gradually, losing about 0.5-1.0% active chlorine per day at 25°C. Decomposition accelerates with heat, light exposure, or metal contamination (especially copper and nickel). Modern formulations often include sodium hydroxide (0.1-1%) as a stabilizer to slow degradation. When mixed with acids, it produces toxic chlorine gas - a significant safety consideration.
Main Applications
In water treatment, 40g/L solution is used for drinking water disinfection at 1-5 mg/L residual chlorine, and wastewater treatment at 5-20 mg/L doses. Food processing facilities employ it for equipment sanitization (100-200 mg/L contact solutions). The healthcare sector utilizes this concentration for surface disinfection against pathogens including C. difficile spores (5000 mg/L contact solutions). Other applications include pulp bleaching in paper manufacturing, cyanide destruction in mining operations, and odor control in municipal waste handling. The textile industry uses it for fabric bleaching at controlled concentrations.
Safety and Storage
Proper storage requires high-density polyethylene (HDPE) containers with vented caps, kept below 25°C and away from sunlight. Storage areas should be equipped with acid spill kits and chlorine gas detectors. Secondary containment is mandatory for bulk tanks. Personal protective equipment (PPE) including chemical goggles, face shields, PVC gloves and acid-resistant aprons should be used during handling. The solution reacts violently with ammonia products, producing toxic chloramine vapors. First aid measures include immediate flushing with water for eye/skin contact and fresh air inhalation for respiratory exposure.
B2B Procurement Guide
Industrial buyers should verify certificates of analysis for active chlorine content (typically 38-42 g/L) and excess alkalinity (0.15-0.3% as NaOH). Bulk shipments (IBC totes or tankers) offer best value for large-volume users. Consider transportation distance - solutions degrade during transit, especially in warm climates. Some suppliers offer stabilized formulations with extended shelf life. For international shipments, verify compliance with local regulations (e.g., EPA in US, REACH in EU). Just-in-time delivery models help maintain solution potency. Always audit supplier manufacturing processes and quality control systems.
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