Overview
Sodium phosphite (Na3PO3) is an inorganic salt derived from phosphorous acid. It is primarily used as a reducing agent and stabilizer in industrial processes. The compound is commercially available as a white crystalline powder with high water solubility. Its versatility stems from its ability to act as a corrosion inhibitor and reducing agent, making it valuable in water treatment systems, chemical manufacturing, and agricultural applications. Unlike phosphate, phosphite has a lower oxidation state, which contributes to its unique reactivity.
Physical and Chemical Properties
Sodium phosphite is characterized by its high solubility in water and stability under normal conditions. It decomposes at elevated temperatures, releasing phosphine gas, which requires careful handling during high-temperature applications. The compound exhibits strong reducing properties due to the +3 oxidation state of phosphorus. It reacts with oxidizing agents, making it useful in redox reactions. Its density of 2.54 g/cm³ and neutral pH in solution are key identifiers for quality control.
Main Applications
In water treatment, sodium phosphite prevents scale formation and corrosion in boilers and cooling systems. It reacts with dissolved oxygen, protecting metal surfaces from oxidation. The chemical industry employs it as a reducing agent in organic synthesis and as a stabilizer for peroxides. In agriculture, it serves as a fungicide and fertilizer additive due to its systemic activity against pathogens like Phytophthora.
Safety and Storage
While sodium phosphite is non-flammable, it can emit toxic phosphine gas when heated or mixed with acids. Storage areas should be dry and separate from oxidizers like chlorates or nitrates. Personal protective equipment (PPE), including gloves and goggles, is mandatory during handling. Spills should be neutralized with water and contained to prevent environmental contamination. Regulatory compliance (e.g., OSHA, EPA) is essential for bulk storage.
B2B Procurement Guide
Buyers should prioritize suppliers with certifications like ISO 9001 and REACH compliance. Technical specifications must include purity (≥98%), heavy metal content (<10 ppm), and moisture levels (<0.5%). Packaging options include 25kg woven bags or 1-ton bulk containers. Prices fluctuate based on raw material costs; long-term contracts may secure better rates. Sample testing for solubility and reactivity is recommended before large-scale procurement.
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