P
Phosphorus

atomic no. 15, atomic wt. 30.975, non-metal, row 4, col 5A, val. 3-5, orbits 2-8-5


{Merck Index - © 1952 by Merck & Co., Inc.}

Phosphorus. P; at. wt. 30.975; at. no. 15; valence 3-5. Discovered in 1669 by Brandt. Does not occur free in nature; found in form of phosphates in the minerals chlorapatite, fluorapatite, vivianite, wavelite, and "phosphate rock" (S. Carolina, Florida, Tennessee); occurs in small quantities in granite rocks; occurs in all fertile soil; an essential constituent of protoplasm, nervous tissue, and bones. Prepn. Ullmann, Enzyklopädie der Technischen Chemie 8, 362 (1931); DeWitt, Skolnik, J. Am. Chem. Sec. 68, 2305 (1946); Skolnik, Tarbutton, Bergman, ibid. 2310.

Phosphorus exists in three allotropic forms: white, black, and red.

White phosphorus: Colorless or yellowish, transparent, crystalline solid; darkens on exposure to light; m. 44.1° (vapor press. 0.181 mm.); b. 280° d. 1.83; volatile; sublimes in vacuo. at ordinary temperature when exposed to light. When exposed to air in the dark, emits a greenish light and gives off white fumes. Almost insoluble in water (one part in 300,000 parts of water); very slightly soluble in abs. alcohol (1 g./ 400 ml.); slightly sol. in abs. ether (1 g./ 102 ml.); soluble in chloroform (1 g./ 40 ml.); soluble in benzene (1 g./ 35 ml.); very soluble in carbon disulfide (1 g./ O.8 ml.). Solubility in oils: one gram phosphorus dissolves in 80 ml. olive oil, 60 ml. oil of turpentine, about 100 ml. almond oil.

Ignites at about 30° in moist air; the ignition temperature is higher when the air is dry.

Caution: Handle with forceps. Keep under water.

The fumes and the element itself are poisonous. Combines directly with the halogens to form tri- or pentahahdes; combines with sulfur to form sulfides. Reacts with several metals to form phosphides. Yields orthophosphoric acid when treated with nitric acid. Reacts with alkali hydroxides with formation of phosphine and sodium hypophosphite.

Incompat. Sulfur, iodine, oil of turpentine, potassium chlorate.

Use: Mannf. rat poisons; for smoke screens, gas analysis.

Black phosphorus: Crystals; resembles graphite in texture; produced from the white modification under high pressures: Bridgman,. J. Am. Chem. Sec. 36, 1344 (1914); Jacobs, J. Chem. Phys. 5, 945 (1937). d. 2.691. Does not catch fire spontaneously. Insoluble in organic solvents.

Red phosphorus: Red to violet powder; polymorphism: Roth, DeWitt, Smith, J. Am. Chem. Sec. 69, 2881 (1947). Its properties are intermediate between those of the white and black forms. Sublimes at 416°, triple point 589.5° under 43.1 atm. d. 2.34. Insoluble in orgamc solvents. Soluble in phosphorus tribromide. Less active than the white form; reacts only at high temperatures. Yields the white modification when distilled at 290°. Catches fire when heated in air to about 260° and burns with formation of the pentoxide. Burns when heated in an atmosphere of chlorine.

Caution: Avoid contact with KClO3, KMnO4, peroxides and other oxidizing agents because with these explosions may result on contact or friction.

Use: (Red phosphorus): Pyrotechnics; manuf. safety matches; in organic synthesis; manuf. phosphoric acid, phosphine, phosphoric anhydride, phosphorus pentachloride, phos phorus trichloride; raanuf. fertilizers, pesticides, incendiary shells, smoke bombs, tracer bullets.

Toxicity: (White phosphorus): Ingestion produces severe G.I. irritation, bloody diarrhea, liver damage, skin eruptions, hematuria, collapse, coma, convulsions. Extern. causes severe burns.

{Mineral Deficiencies in Plants}

Phosphorus, like nitrogen is closely concerned with the vital growth process in plants as it is a constituent of nucleic acid and nuclei in which this occurs are essential parts of all living cells. Hence a deficiency of this element will also be expected to result in greatly restricted growth. Phosphorus is also of importance in seeds and in connection with the metabolism of fats. Compounds of phosphorus are concerned with the process of respiration and with the efficient functioning and utilization of nitrogen. This relationship to nitrogen probably accounts for the fact that several of the symptoms of phosphorus deficiency are identical or similar to those which result from a deficiency of nitrogen. Phosphorus is also of special importance in the processes concerned in root development and the ripening of seeds


Special Note:

Commercial preparations of plant food have a somewhat misleading labeling system.

It is often said that the three main numbers listed is the amount of Nitrogen, Phosphorus, and Potassium in the product.   This is NOT the case.   You must real the label carefully.

If you read carefully, you will find that the middle number is the percentage of Phosphate – NOT Phosphorus – expressed as P2O5.   This means that you need to multiply the number by 0.436 to obtain the actual amount of Phosphorus present in the product.   Therefore, if the middle number is 30, the actual amount of Phosphorus is only 13.08%.


Dear Sir:

"Tianjin Consulting and Trade Company limited" is Sichuan Norwest phosphate Chemicals company's sale company in Tianjin city china. We mainly sale low Arsenic high purified elemental phosphorus(P4) for electronics pharmaceuticals and food industries.

Our speciality is to produce international standard for export to international chemical companies. We are currently exporting products to Europe, Japan, North America and Australia.

ELEMENTAL PHOSPHORUS (P4)
LOW ARSENIC EXPORT GRADE

Specifications :

Content                                  99.95% min          99.97 Typical
Color                                    White Yellow
Insoluble Matter in CS2                  0.05% Max            0.03 Typical
As                                       50 ppm Average  40-80 ppm Typical
Fe                                       0.0085%
Pb                                       0.0034%
Ca                                       0,0016%
Mg                                       0.0016%
Ni                                       0.0003%
Zn                                       0.0023%
Cu                                       0.00034%
Hg                                       0.000004%
F                                        0.0015%
Cd                                       0.00065%

Product Specification Number EPLAEG 9801

Packaging:   200 kilo export quality in steel drums
Price:       USD1350 per metric tonne F.O.B. Tianjin Port PRC
Qquantity:   Minimum order quantity 96 metric tonnes(6 @ 20 foot container)
Payment:     Irrevocable comfirmed letter of credit acceptable to Seller's
             bank

Availability: Current
Supply cpacity:   1,000 tonnes/month

Product has the PRC equivalent of ISO9002

Our product strengths include:

     Very Low Arsenic
     
     Very Low Muds

     Very Low Oils

Address:     1304-8 Third High Building Shuishangchun 
             Nankai District Tianjin China
Post Code:   300074
tel/fax:     0086+22+23343305

best regards


yours
Liumin
Managing Director

 
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