LYCOS RETRIEVER 
Phosphorus: Forms
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Hittorf's phosphorus is another crystalline allotrope formed by heating phosphorus with lead in a sealed tube to redness, and removing the lead by boiling the product with nitric and hydrochloric acid. It is ... obtained by heating red phosphorus under pressure to 580°. It forms a lustrous, nearly black crystalline mass, composed of minute rhombohedra. G. E. Linck and P. Moller (Ber., 1908, 41, p. 1404) have affirmed that the product of the first process always contains lead. E. Cohen and J. Olie, Jun. (Abs. Jour.
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The main factors influencing P movement can be separated into the transport, phosphorus source, and phosphorus management factors. Transport factors include the mechanism by which P moves within the landscape. These are rainfall, irrigation, erosion and runoff. Factors which influence the source and amount of P available to be transported are soil P content and form of P applied. Phosphorus management factors include the method of application, timing, and placement in the landscape as influenced by the management of application equipment and tillage.
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The phosphorus-free restriction is limited to the Twin Cities metro area and Crow Wing County. Outside of these two areas, lawn fertilizer is restricted to three percent phosphate content, which is readily available. In the fertilizer industry, phosphorus content is measured as phosphate, a form of phosphorus. The phosphate content of lawn fertilizer is given by the middle number in a string of three numbers printed on the bag.
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In 1865 Hittorf discovered that when phosphorus was recrystallized from molten lead, a red/purple form is obtained. This purple form is sometimes known as "Hittorf's phosphorus." In addition, a fibrous form exists with similar phosphorus cages. Below is shown a chain of phosphorus atoms which exhibits both the purple and fibrous forms.
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SRP is generally low in phosphorus limited situations while SUP may be relatively constant. Increases in SRP or variations in SUP would adversely affect chlorophyll phosphorus relationships. Forms of particulate phosphorus, other than algal phosphorus, must ... be negligible, constant, or change as a function of chlorophyll. Chlorophyll would be expected to relate best to total phosphorus in situations where there are negligible amounts of clays, suspended sediments, and detritus, where phosphorus limits algal biomass, and in natural lakes that have sufficient depth that bottom sediments are not resuspended.
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Six radioactive isotopes of phosphorus are known .... A radioactive isotope is one that breaks apart and gives off some form of radiation. Radioactive isotopes are produced when very small particles are fired at atoms. These particles stick in the atoms and make them radioactive.
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