Overview
Potassium alum buffer, chemically known as potassium aluminum sulfate dodecahydrate, is an inorganic compound with a long history of use in various industries. It forms colorless, octahedral crystals that readily dissolve in water. The compound has been employed since ancient times for water purification and tanning processes. In modern applications, potassium alum serves as an effective buffer and coagulant. Its ability to form stable solutions with consistent pH makes it valuable in both industrial processes and laboratory settings. The compound is generally recognized as safe (GRAS) for certain food applications when used in controlled quantities.
Physical and Chemical Properties
Potassium alum buffer exhibits several distinctive physical and chemical characteristics. The crystalline solid has a density of 1.76 g/cm³ and melts at 92-93°C with loss of water molecules. Its molecular structure contains aluminum and potassium ions surrounded by sulfate anions and water molecules in a specific crystalline arrangement. The compound demonstrates excellent solubility in water (14.4 g/100 mL at 20°C) but is insoluble in alcohol. In aqueous solution, it dissociates to create an acidic environment (pH ~3.3 for 1% solution). This acidifying property, combined with its ability to form aluminum hydroxide flocs, makes it particularly useful for coagulation processes in water treatment applications.
Main Applications
The primary industrial application of potassium alum buffer is in water treatment systems, where it serves as a coagulant to remove suspended particles and clarify water. It's particularly effective in treating low-turbidity water and is commonly used in municipal water plants and swimming pool maintenance. In the food industry, potassium alum finds use as a firming agent in pickling processes and as a leavening acid in baking powders. The pharmaceutical industry utilizes its astringent properties in topical preparations, while laboratories employ it as a chemical reagent and buffer solution component.
Safety and Storage
While potassium alum is generally considered low in toxicity, proper handling precautions should be observed. The compound may cause mild skin and eye irritation upon direct contact, and inhalation of dust should be avoided. Appropriate personal protective equipment including gloves and safety glasses is recommended during handling. For storage, potassium alum should be kept in airtight containers in a cool, dry environment away from incompatible substances such as strong bases. The material is stable under normal conditions but may absorb moisture from humid atmospheres, potentially leading to caking or reduced flowability in powdered forms.
B2B Procurement Guide
When procuring potassium alum buffer for industrial applications, buyers should specify the required purity level, which typically ranges from 98% to 99.9% depending on the intended use. Food-grade material must meet additional regulatory standards such as FCC or USP specifications. Bulk purchases are commonly available in 25 kg bags or 1,000 kg supersacks, with pricing typically decreasing with larger order quantities. Lead times may vary based on supplier inventory and production schedules, so advance planning is recommended for large-scale requirements. Quality verification through certificate of analysis (CoA) should be standard practice.
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