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Topic: Phosphorus


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In the News (Mon 17 Jun 19)

  
  Phosphorus - Wikipedia, the free encyclopedia
Phosphorus, (from the Greek language phôs meaning "light", and phoros meaning "bearer"), is the chemical element in the periodic table that has the symbol P and atomic number 15.
White phosphorus is used in military applications as incendiary bombs, for smoke-screening as smoke pots and smoke bombs, and in tracer ammunition.
This is a particularly poisonous element with 50 mg being the average fatal dose (white phosphorus is generally considered to be the lethal form of phosphorus while phosphate and orthophosphate are essential nutrients).
en.wikipedia.org /wiki/Phosphorus   (1704 words)

  
 Phosphorus, Linus Pauling Institute's Micronutrient Information Center
Phosphorus is a major structural component of bone in the form of a calcium phosphate salt called hydroxyapatite.
The regulation of blood calcium and phosphorus levels is interrelated through the actions of parathyroid hormone (PTH) and vitamin D (diagram) A slight drop in blood calcium levels (e.g., in the case of inadequate calcium intake) is sensed by the parathyroid glands resulting in their increased secretion of PTH.
The increased urinary excretion of phosphorus is advantageous in bringing blood calcium levels up to normal because high blood levels of phosphate suppress the conversion of vitamin D to its active form in the kidneys (4).
lpi.oregonstate.edu /infocenter/minerals/phosphorus   (1726 words)

  
 Phosphorus   (Site not responding. Last check: 2007-10-21)
Phosphorus is an essential ingredient of all cell protoplasm, nervous tissue, and bones.
White phosphorus should be kept under water, as it is dangerously reactive in air, and it should be handled with forceps, as contact with the skin may cause severe burns.
Elementary phosphorus is liberated as vapor and may be collected under phosphoric acid, an important compound in making super-phosphate fertilizers.
www.scescape.net /~woods/elements/phosphorus.html   (478 words)

  
 Water Resource Characterization DSS - Phosphorus
Phosphorus is the eleventh-most abundant mineral in the earth's crust and does not exist in a gaseous state.
The dissolved phosphorus (usually as orthophosphate) is assimilated by phytoplankton and altered to organic phosphorus.
Phosphorus stored in the uppermost layers of the bottom sediments of lakes and reservoirs is subject to bioturbation by benthic invertebrates and chemical transformations by water chemistry changes.
www.water.ncsu.edu /watershedss/info/phos.html   (1728 words)

  
 Phosphorus
Phosphorus is an important agricultural fertilizer, an essential element in metabolism and the transfer of biological energy, a component of matches, an ingredient in pyrotechnic applications, and besides of considerable scientific interest.
Phosphorus is in column VA of the periodic table, between nitrogen and arsenic, neither of which it resembles.
Phosphorus pentoxide is hydrolyzed in water to form one of several phosphoric acids.
www.du.edu /~jcalvert/phys/phosphor.htm   (4879 words)

  
 ENIVA: Phosphorus   (Site not responding. Last check: 2007-10-21)
Phosphorus is needed for many of the chemical reactions in the body.
Phosphorus is also a constituent of nucleic acids, the holders of genetic information for the body.
An apparent reduction in the incidence of milk fever achieved by regulation of the dietary intake of calcium and phosphorus.
www.eniva.com /products/mfl_phosphorus.html   (669 words)

  
 Gale Encyclopedia of Alternative Medicine: Phosphorus
Though phosphorus is found in every cell of the human body and accounts for 1% of the body's total weight, its primary function is working in conjunction with calcium to form teeth and bones.
Phosphorus is necessary for the regularity of the heartbeat, and aids in the contraction of all other muscles throughout the body.
Phosphorus is needed for the functioning of the kidneys and plays a part in the conduction of impulses along the network that makes up the nervous system.
www.findarticles.com /p/articles/mi_g2603/is_0005/ai_2603000588   (1346 words)

  
 White Phosphorus (WP)
The use of white phosphorus or fuel air explosives are not prohibited or restricted by Protocol II of the Certain Conventional Weapons Convention (CCWC), the Convention on Prohibitions or Restrictions on the Use of Certain Conventional Weapons which may be Deemed to be Excessively Injurious or to have Indiscriminate Effects.
Phosphorus also becomes luminous in the dark, and this property is conveyed to "tracer bullets." This chemical reaction continues until either all the material is consumed or the element is deprived of oxygen.
Phosphorus burns on the skin are deep and painful; a firm eschar is produced and is surrounded by vesiculation.
www.globalsecurity.org /military/systems/munitions/wp.htm   (2316 words)

  
 Phosphorus   (Site not responding. Last check: 2007-10-21)
Phosphorus has a negative charge so up to 90% of what is applied gets tied up and ties up other elements with it.
The Phosphorus concentration in the ocean also is low because the ocean environment precipitates phosphorus to the insoluble form solid apatite.
On acid soils, it is best not to broadcast the phosphorus fertilizer and to mix in thoroughly with the soil, but to apply it in bands or as pellets so that it does not suffer to great a loss of availability.
www.russellagriservice.com /Phosphorus.html   (1753 words)

  
 Chemistry : Periodic Table : phosphorus : key information
Phosphorus exists in several allotropic forms including white (or yellow), red, and fl (or violet).
The red modification is fairly stable and sublimes with a vapour pressure of 1 atmosphere at 417°C. Isolation
However there is plenty of phosphorus in phosphate ores and those ores represent the usual source for commercially produced phosphorus.
www.webelements.com /webelements/elements/text/P/key.html   (255 words)

  
 Phosphorus (P) - Chemical properties, Health and Environmental effects
Chemical properties of phosphorus - Health effects of phosphorus - Environmental effects of phosphorus
White phosphorus is not likely to spread, because it reacts with oxygen fairly quickly.
In water, white phosphorus is not reacting with other particles that quickly and as a result it will accumulate in the bodies of aquatic organisms.
www.lenntech.com /Periodic-chart-elements/P-en.htm   (522 words)

  
 Urbanization/water quality: Phosphorus
Phosphorus is a common constituent of agricultural fertilizers, manure, and organic wastes in sewage and industrial effluent.
Phosphorus is an essential element for plant life, but when there is too much of it in water, it can speed up eutrophication (a reduction in dissolved oxygen in water bodies caused by an increase of mineral and organic nutrients) of rivers and lakes.
Additional control of phosphorus from non-point sources (such as applications of lawn fertilizers and disposal of animal wastes) may be useful to maintain or improve the water quality in streams and lakes near growing urban areas.
ga.water.usgs.gov /edu/urbanpho.html   (573 words)

  
 It's Elemental - The Element Phosphorus
Red phosphorus is not poisonous and is not as dangerous as white phosphorus, although frictional heating is enough to change it back to white phosphorus.
Black phosphorus is also formed by heating white phosphorus, but a mercury catalyst and a seed crystal of fl phosphorus are required.
Some phosphorus compounds glow in the dark or emit light in response to absorbing radiation and are used in fluorescent light bulbs and television sets.
education.jlab.org /itselemental/ele015.html   (263 words)

  
 BASIN: General Information on Phosphorus
Phosphorus is a nutrient required by all organisms for the basic processes of life.
Phosphorus clings tightly to soil particles and is used by plants, so its concentrations in clean waters is generally very low.
Both phosphorus and orthophosphate are often measured using a colorimetric method, which means the color of treated sample reflects the concentration of the parameter.
bcn.boulder.co.us /basin/data/NUTRIENTS/info/TP.html   (1575 words)

  
 Phosphorus Index | NRCS
Phosphorus is generally the limiting nutrient in fresh water systems and any increase in P is usually results in more aquatic vegetation.
Phosphorus management factors include the method of application, timing, and placement in the landscape as influenced by the management of application equipment and tillage.
The purpose of the Phosphorus Index is to provide field staffs, watershed planners, and land users with a tool to assess the various landforms and management practices for potential risk of phosphorus movement to water bodies.
www.nrcs.usda.gov /technical/ECS/nutrient/pindex.html   (4301 words)

  
 phosphorus
White phosphorus has two modifications: alpha and beta with a transition temperature at -3.8 deg C. Never found free in nature, it is widely distributed in combination with minerals.
Concn of phosphorus were less than 1% in barley, corn, Durum wheat, flax, and spring wheat dusts, while oats and selected other grain dusts contained approximately 4000 and 2800 ppm, respectively.
Phosphorus (white or yellow) is a waste chemical stream constituent which may be subjected to ultimate disposal by controlled incineration.
www.speclab.com /elements/phosphorus.htm   (1487 words)

  
 ATSDR - ToxFAQs™: White Phosphorus
White phosphorus is used by the military in various types of ammunition, and to produce smoke for concealing troop movements and identifying targets.
In water with low oxygen, white phosphorus may degrade to a highly toxic compound called phosphine, which eventually evaporates to the air and is changed to less harmful chemicals.
Breathing white phosphorus for long periods may cause a condition known as "phossy jaw" which involves poor wound healing of the mouth and breakdown of the jaw bone.
www.atsdr.cdc.gov /tfacts103.html   (979 words)

  
 Phosphorus   (Site not responding. Last check: 2007-10-21)
Phosphorus availability was 60 to 100% of applied cattle manure P and 52 to 100% of swine slurry P in the three soils.
Phosphorus fertilizer, while expensive, is often necessary for wheat, barley, corn and other crops to produce profitable yields.
Phosphorus, in particular fertilizer containing phosphorus, is under attack from some municipalities in Michigan that are considering ordinances that would...
carcinogens.cancer-help.org /Phosphorus.html   (12315 words)

  
 Chemistry and the Aquarium
Phosphorus is one of the basic building blocks of living matter.
Since phosphorus is required for growing tissue, it is mandatory that there be some phosphorus source for corals growing in a reef tank.
Issues involving phosphorus can be among the most difficult to diagnose in a reef tank, especially if the live rock and sand have been exposed to very high phosphate levels and may be acting as a phosphate reservoir.
www.advancedaquarist.com /issues/sept2002/chem.htm   (3082 words)

  
 Phosphorus Sodium DRI/RDA,negative health/side effects, overdose, toxicity, nutritional requirements
Phosphorus, when high in ratio to calcium, is well established as being a contributing factor with bone
Phosphorus and calcium metabolism is linked, and requires Vitamin D for uptake.
phosphorus are increased by parathyroid hormone, and decreased by the thyroid hormone calcitonin.
www.acu-cell.com /pna.html   (1761 words)

  
 Phosphorus [P] [15] - Chemical element datasheet - Periodic Table of the Elements - ChemGlobe
Phosphorus [P] [15] - Chemical element datasheet - Periodic Table of the Elements - ChemGlobe
Pure phosphorus is obtained by heating a mixture of phosphate rock, coke, and silica to about 1450 °C. Use(s):
Also some applications for it and some of its compounds which glow in the dark.
pol.spurious.biz /projects/chemglobe/ptoe/_/15.html   (77 words)

  
 Phosphorus   (Site not responding. Last check: 2007-10-21)
Along with the B vitamins, phosphorus is needed to extract energy from food, particularly fats and starches.
Phosphorus also helps with kidney functioning and heart regularity.
But none of this would be possible without proper levels of vitamin D and calcium, which phosphorus needs to function properly.
www.mmeade.com /cheat/phosphorus.html   (218 words)

  
 Phosphorus
This is one of a series of reports presenting dietary reference intake (DRI) values for a range of nutrients, produced by the Food and Nutrition Board of the Institute of Medicine.
Peer-reviewed medical journals have been reviewed by medical experts to provide guidance on maintaining normal serum phosphorus levels in order to prevent bone abnormalites associated with hyperphosphatemia (high phosphorus levels).
Peer-reviewed medical journals have been reviewed by medical experts to provide guidance on managing the dietary intake of phosphorus in patients with kidney failure who have elevated serum phosphorus levels.
omni.ac.uk /browse/mesh/D010758.html   (509 words)

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