Overview
Potassium bromide (KBr) is an inorganic compound consisting of potassium and bromide ions. It has been historically significant in medicine as an anticonvulsant and sedative, though modern medical use has declined due to safer alternatives. Today, its primary applications are in industrial and scientific fields. The compound is produced through the reaction of potassium carbonate with hydrobromic acid or iron bromide. Pharmaceutical-grade KBr requires stringent purity standards, while technical-grade material is adequate for industrial applications. Its stable chemical properties and high solubility make it versatile for various uses.
Physical and Chemical Properties
Potassium bromide forms colorless cubic crystals similar to sodium chloride. It has a high melting point of 734°C and is stable under normal temperatures and pressures. The substance is non-hygroscopic, meaning it doesn't readily absorb moisture from the air, which contributes to its long shelf life. In aqueous solution, KBr completely dissociates into potassium and bromide ions. This property makes it valuable in chemical analysis and as an electrolyte. The bromide ion contributes to its applications in photography, where it acts as a restrainer in developing solutions to control the reduction of silver halides.
Main Applications
In spectroscopy, potassium bromide pellets are essential for infrared spectroscopy sample preparation due to their transparency to infrared radiation. The pharmaceutical industry uses KBr in some veterinary medicines as an anticonvulsant for dogs with epilepsy. The photographic industry employs potassium bromide in developing solutions and gelatin silver emulsion processes. In industrial applications, it serves as a source of bromide ions for chemical synthesis and as a laboratory reagent. Recent research explores its potential in energy storage systems and as a component in specialty glasses.
Safety and Storage
While potassium bromide has low acute toxicity, prolonged exposure can lead to bromism, a condition caused by excessive bromide accumulation. Symptoms may include neurological effects such as drowsiness, irritability, or memory loss. Proper personal protective equipment (gloves, goggles) should be used when handling powdered forms. Storage recommendations include keeping containers tightly closed in a dry, cool environment away from strong acids and oxidizing agents. Bulk quantities should be stored on pallets in well-ventilated areas to prevent moisture accumulation. Spills should be cleaned promptly with appropriate absorbent materials.
B2B Procurement Guide
When sourcing potassium bromide commercially, buyers should specify the required grade (pharmaceutical, reagent, technical) based on intended use. Pharmaceutical-grade material must meet USP or EP standards with purity typically ≥99%. Reagent-grade material for laboratory use should have documented impurity profiles. Reliable suppliers will provide certificates of analysis, material safety data sheets, and proper labeling. Bulk shipments typically come in 25kg bags or drums, while smaller quantities may be packaged in bottles or plastic containers. Consider delivery times, minimum order quantities, and the supplier's ability to provide consistent quality across multiple batches.
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