Overview
Sodium chloride solution is a fundamental chemical preparation consisting of NaCl dissolved in water at varying concentrations. Its isotonic 0.9% formulation (normal saline) is critical in healthcare for intravenous therapy and wound irrigation. Industrially, higher-concentration brines serve as heat-transfer fluids, de-icing agents, and food preservation mediums. The solution's versatility stems from NaCl's ionic dissociation in water, creating conductive electrolytes essential for biological and electrochemical processes. Pharmaceutical-grade solutions undergo strict sterilization, while industrial grades prioritize cost-efficiency and purity thresholds.
Physical and Chemical Properties
As a binary aqueous system, sodium chloride solution's properties depend on concentration. At 20°C, saturation occurs at ~26% w/w NaCl, yielding a density of 1.2 g/cm³. The solution exhibits colligative properties: freezing point depression (eutectic at -21°C) and boiling point elevation. Electrically, conductivity peaks near 5M concentration due to ion mobility trade-offs. Chemically inert to most materials, it nonetheless accelerates corrosion in ferrous metals via chloride ion activity. Solutions maintain near-neutral pH (6-7.5) unless contaminated.
Main Applications
Healthcare dominates high-purity usage, with 0.9% saline comprising 80%+ of hospital IV fluids. Sterile solutions meet USP/EP standards for injection compatibility. Food processors utilize brines for meat curing (15-20% NaCl) and vegetable fermentation (5-10%). Industrial applications include: chlorine-alkali electrolysis (25% saturated brine), refrigeration brines, and oilfield drilling fluids. Environmental uses encompass road de-icing (23% solution) and water softening regeneration. Laboratories employ standardized solutions as calibration standards and reaction media.
Safety and Storage
While generally low-risk, concentrated brines (>10%) may cause skin dehydration or eye irritation. OSHA PEL applies only to aerosolized mists (5mg/m³). Store in HDPE or glass containers; avoid carbon steel tanks for long-term storage. Bulk solutions require biocide treatment if stored beyond 30 days to prevent microbial growth. Transportation complies with non-hazardous material regulations (UN number not required). Spills can be diluted with water and require no special remediation beyond standard slip prevention.
B2B Procurement Guide
Specify: 1) Concentration (wt%/molarity), 2) Purity grade (USP/ACS/industrial), 3) Sterility requirements, and 4) Packaging (IBCs/drums/carboy). Medical buyers should verify GMP certification and endotoxin levels (<0.5 EU/mL). Bulk shipments (20,000L+) commonly negotiate spot pricing based on NaCl commodity rates. For food-grade purchases, demand certificates of analysis for heavy metals (Pb<1ppm) and iodine content. Industrial users should clarify iron (Fe<5ppm) and sulfate (SO₄<10ppm) limits to prevent equipment scaling.
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