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Uses In recent years, concentrated phosphoric acids, which may contain as much as 70% to 75% P2O5 content, have become of great importance to agriculture and farm production. World-wide demand for fertilizers has caused record phosphate production. Phosphates are used in the production of special glasses, such as those used for sodium lamps. Bone-ash, calcium phosphate, is used to create fine chinaware and to produce mono-calcium phosphate, used in baking powder. Phosphorus is also important in the production of steels, phosphor bronze, and many other products.

50/g. 9% pure costs about $50/lb; hyperpure silicon may cost as much as $100/oz. html (2 of 3) [10/24/2001 5:40:09 PM] Silicon Handling Miners, stonecutters, and others engaged in work where siliceous dust is breathed into large quantities often develop a serious lung disease known as silicosis. Isotopes Sources: CRC Handbook of Chemistry and Physics and the American Chemical Society. 97376 Electron Configuration: [Ne]3s23p3 History (Gr. phosphoros, light bearing; ancient name for the planet Venus when appearing before sunrise) Brand discovered phosphorus in 1669 by preparing it from urine.

About 80% of the vanadium now produced is used as ferrovanadium or as a steel additive. Vanadium foil is used as a bonding agent in cladding titanium to steel. Vanadium pentoxide is used in ceramics and as a catalyst. It is also used to produce a superconductive magnet with a field of 175,000 gauss. Handling Vanadium and its compounds are toxic and should be handled with care. 05 (8-hour time-weighted average - 40-hour week). Costs Ductile vanadium is commercially available. Commercial vanadium metal, of about 95% purity, costs about $20/lb.

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