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Italmatch Chemicals S.p.A. - Manufacturers of red phosphorus, phosphorus sesquisulfide, phosphorus pentasulfide and masterbatches for flame retardance of plastics based on red phosphorus.
Phosphorus - A discussion of phosphorus with functions, deficiency signs, food sources, supplements, and recommendations from the Linus Pauling Institute.
Mianyang Tianming Phosphorus Chemical Industry Co., Ltd. - Produces yellow phosphorus, phosphoric acid and phosphates.
Prachi Poly Products Ltd. - Manufacturer of phosphorus pentasulphide, phosphorus pentoxide, and food grade phosphoric acid.
Qimingxing Phosphorus Chemical Industry Co., Ltd. - Engaged in manufacturing yellow phosphorus, phosphoric acid and fine phosphate chemicals.
Wikipedia: Phosphorus - Properties of the element, including its history, applications, and characteristics.
Visual Elements: Phosphorus - Image, general and physical information, source, uses, key isotopes, and ionisation energies.
Phosphorus - Data tables and historic information.
White Phosphorus - White phosphorus is a waxy solid which burns easily and is used in chemical manufacturing and smoke munitions. Exposure to white phosphorus may cause burns and irritation, liver, kidney, heart, lung, or bone damage, and death.
Understanding Phosphorus and its Use in Agriculture - This booklet considers the essential need for phosphorus in agriculture. Available as HTML or PDF.

Phosphorus cycle - The phosphorus cycle is the biogeochemical cycle that describes the movement of phosphorus through the lithosphere, hydrosphere, and biosphere. Unlike many other biogeochemical cycles, the atmosphere does not play a significant role in the movements of phosphorus, because phosphorus and phosphorus-based compounds are usually solids at the typical ranges of temperature and pressure found on Earth.
Phosphorus - Phosphorus, (, meaning "light", and phoros meaning "bearer"), is the chemical element that has the symbol P and atomic number 15. A multivalent nonmetal of the nitrogen group, phosphorus is commonly found in inorganic phosphate rocks.
Phosphorus pentasulfide - Phosphorus pentasulfide is the chemical compound with the formula P4S10. This yellow solid is an industrially important inorganic compound of phosphorus and sulfur.
Phosphorus acid - Phosphorus acid are oxoacids of phosphorus. Examples include:
Phosphorus pentafluoride - Phosphorus pentafluoride, PF5, is a phosphorus halide. The phosphous atom is in the highest oxidation state possible, +5.