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Phosphorus. Phosphorus is a chemical element; it has symbol P and atomic number 15. Elemental phosphorus exists in two major forms, white phosphorus and red phosphorus, but because it is highly reactive, phosphorus is never found as a free element on Earth. It has a concentration in the Earth's crust of about one gram per kilogram (compare ...
The phosphorus cycle is the biogeochemical cycle that involves 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 movement of phosphorus, because phosphorus and phosphorus-based materials do not enter the gaseous phase readily, [1] as the main source of gaseous phosphorus ...
Phosphorite, phosphate rock or rock phosphate is a non- detrital sedimentary rock that contains high amounts of phosphate minerals. The phosphate content of phosphorite (or grade of phosphate rock) varies greatly, from 4% [ 1] to 20% phosphorus pentoxide (P 2 O 5 ). Marketed phosphate rock is enriched ("beneficiated") to at least 28%, often ...
Phosphates are the naturally occurring form of the element phosphorus, found in many phosphate minerals. In mineralogy and geology, phosphate refers to a rock or ore containing phosphate ions. Inorganic phosphates are mined to obtain phosphorus for use in agriculture and industry.
Phosphoria Formation. An outcrop of the Phosphoria Formation near the Big Hole River in western Montana. The Phosphoria Formation of the western United States is a geological formation of Early Permian age. [ 4] It represents some 15 million years of sedimentation, reaches a thickness of 420 metres (1,380 ft) and covers an area of 350,000 ...
The single-bonded oxygen atoms that are not shared are completed with acidic hydrogen atoms. The general formula of a phosphoric acid is Hn+2−2xPnO3n+1−x, where n is the number of phosphorus atoms and x is the number of fundamental cycles in the molecule's structure, between 0 and n + 2 2 . Pyrophosphate anion. Trimethyl orthophosphate.
Phytic acid is a six-fold dihydrogenphosphate ester of inositol (specifically, of the myo isomer ), also called inositol hexaphosphate, inositol hexakisphosphate ( IP6) or inositol polyphosphate. At physiological pH, the phosphates are partially ionized, resulting in the phytate anion . The ( myo) phytate anion is a colorless species that has ...
Electroluminescence can be exploited in light sources. Such sources typically emit from a large area, which makes them suitable for backlights of LCD displays. The excitation of the phosphor is usually achieved by application of high-intensity electric field, usually with suitable frequency. Current electroluminescent light sources tend to ...
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