Overview
Acetate standard buffer solution is a pre-mixed chemical solution primarily used for calibrating pH meters and ensuring accurate pH measurements in laboratories. It consists of acetic acid and sodium acetate, which form a buffer system resistant to pH changes when diluted or exposed to small amounts of acids/bases. The solution is standardized to a pH of 4.01±0.01 at 25°C, making it ideal for mid-range pH calibration. It is widely adopted in pharmaceuticals, food testing, and environmental analysis due to its stability and reproducibility.
Physical and Chemical Properties
The acetate buffer solution is a clear, odorless liquid with a density close to water (~1.0 g/cm³). Its pH stability stems from the equilibrium between acetic acid (a weak acid) and its conjugate base (acetate ions), which minimizes fluctuations in hydrogen ion concentration. Key chemical properties include low volatility and compatibility with most electrode materials. The solution is typically supplied in sealed bottles to prevent evaporation or CO₂ absorption, which could alter its pH. Shelf life ranges from 6 months to 2 years, depending on storage conditions.
Main Applications
The primary use of acetate buffer solution is calibrating pH meters, especially for measurements in the acidic range (pH 3–5). It serves as a secondary standard after primary buffers like pH 7.01 or 10.01 solutions. In industrial settings, it is employed for quality control in chemical manufacturing, wastewater treatment, and food processing (e.g., vinegar or dairy products). Research laboratories also utilize it for biochemical assays and as a reaction medium where controlled acidity is critical.
Safety and Storage
While generally non-hazardous, acetate buffer may cause mild irritation to eyes or skin upon direct contact. Personal protective equipment (PPE) such as gloves and goggles is recommended during handling. Storage should be in tightly sealed containers at 15–25°C, avoiding exposure to sunlight or extreme temperatures. Contamination from foreign substances (e.g., dirty electrodes) can degrade performance, so always use clean glassware for dispensing.
B2B Procurement Guide
For bulk procurement, prioritize suppliers with ISO 17025 accreditation or traceable certification (e.g., NIST). Key specifications to verify include pH accuracy (±0.01), batch consistency, and expiry date. Pricing varies with volume; discounts may apply for orders exceeding 10 liters. Consider ready-to-use solutions over powdered forms to minimize preparation errors. For international shipments, ensure compliance with transportation regulations for non-hazardous liquids.
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