Overview
Strontium is an alkaline earth metal discovered in 1790 by Adair Crawford. It is the 15th most abundant element in the Earth's crust and is typically extracted from minerals like celestite and strontianite. Strontium shares chemical properties with calcium and barium, making it useful in various industrial and medical applications. Due to its high reactivity, strontium is never found in its pure form in nature. It quickly forms compounds with oxygen and water, which are more stable and commonly used in commercial products. The element has four stable isotopes, with strontium-88 being the most abundant.
Physical and Chemical Properties
Strontium is a soft, silvery-white metal that is malleable and ductile. It has a density of 2.64 g/cm³, which is lower than most other metals in its group. The metal oxidizes rapidly in air, forming a yellowish oxide layer, and reacts vigorously with water to produce strontium hydroxide and hydrogen gas. Strontium compounds exhibit unique properties. For example, strontium nitrate burns with a bright red flame, making it valuable in pyrotechnics. Strontium carbonate is insoluble in water but dissolves in acids, while strontium sulfate is highly insoluble, which is useful in certain industrial processes.
Main Applications
The primary use of strontium is in pyrotechnics, where strontium compounds produce vivid red flames in fireworks and flares. Strontium carbonate is a key component in glass manufacturing, particularly for cathode-ray tubes (CRTs) and specialty glasses that block X-ray radiation. In metallurgy, strontium is added to aluminum alloys to improve their machinability and mechanical properties. Medical applications include strontium ranelate, a drug used to treat osteoporosis, and radioactive strontium-89, which is used in cancer therapy to relieve bone pain.
Safety and Storage
Strontium metal is highly reactive and must be stored under mineral oil or inert gas to prevent oxidation. In powder form, it is flammable and can ignite spontaneously in air. Proper handling requires protective equipment, including gloves and eye protection, to avoid contact with skin or eyes. Strontium compounds vary in toxicity. While some, like strontium carbonate, are relatively low-risk, others, such as strontium chromate, are carcinogenic. Always follow safety data sheets (SDS) and regulatory guidelines when handling strontium and its compounds.
B2B Procurement Guide
When procuring strontium, consider the intended application to determine the required purity and form. High-purity strontium (99.5% or higher) is essential for medical and electronic uses, while industrial applications may tolerate lower purity levels. Verify supplier credentials and request certificates of analysis (CoA) to ensure quality. Due to its reactivity, shipping and storage conditions must be carefully managed. Bulk purchases may offer cost savings, but ensure proper inventory turnover to prevent degradation.
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