Overview
Ammonium acetate is an inorganic salt derived from acetic acid and ammonia. The GB standard (Chinese national standard) ensures its purity and suitability for industrial and laboratory applications. It is widely recognized for its role as a buffer in HPLC and mass spectrometry. As a versatile reagent, ammonium acetate is valued for its stability and solubility in polar solvents. Its dual nature—acting as a weak acid or base—makes it indispensable in pH-controlled reactions. The GB standard guarantees compliance with stringent quality benchmarks for critical industries.
Physical and Chemical Properties
Ammonium acetate appears as a white, hygroscopic crystalline solid with a slight acetic acid odor. Its density of 1.17 g/cm³ and low melting point (113-114°C) facilitate easy handling in liquid-phase reactions. The compound decomposes upon heating, releasing ammonia and acetic acid vapors. Its high solubility in water (1480 g/L at 20°C) and alcohol enables flexible formulation. The weak acidity (pKa ~4.75) and buffering capacity between pH 3.7-5.6 are key to its analytical applications. Hygroscopicity necessitates airtight storage to prevent moisture absorption.
Main Applications
In analytical chemistry, ammonium acetate serves as a mobile phase buffer in HPLC for separating polar compounds. It is also used in protein precipitation and DNA purification due to its compatibility with biological samples. The pharmaceutical industry employs it as an excipient and intermediate in synthesizing antibiotics. As a food additive (E264), it acts as a preservative and acidity regulator. Industrial uses include textile dyeing catalysts and foam rubber production.
Safety and Storage
Ammonium acetate poses mild irritation risks (skin/eyes/respiratory tract). PPE such as gloves and goggles are recommended. Spills should be contained with inert absorbents and disposed of as hazardous waste. Store in original containers at room temperature, away from strong acids or oxidizers. Decomposition risks increase above 40°C. Shelf life typically exceeds 2 years when stored properly, though clumping may indicate moisture ingress.
B2B Procurement Guide
Industrial buyers should prioritize suppliers with GB/T 696-2008 certification, ensuring ≥98% purity. Key specifications include heavy metal content (<10 ppm) and chloride/sulfate limits. Bulk procurement (tonnage quantities) often warrants discounted pricing. Verify logistics compatibility—some carriers classify ammonium acetate as hazardous material. For pharmaceutical use, request additional COA and GMP documentation.
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