Strontium nitrate

Strontium nitrate, Sr(N03)2, is a high-density material with a melhng point of 843 K. The initial thermal decomposition in the low-temperature region produces Sr(N02)2, which decomposes to SrO in the high-temperature region according to  

The gaseous products, NO2 and NO, also act as oxidizers when fuel components are present. When strontium nitrate burns with fuel components, a red-colored flame is formed. 

This material is rarely used as the sole oxidizer in a pyrotechnic composition, but it is commonly combined with potassium perchlorate in red flame mixtures. It is a 

Strontium nitrite—Sr(N02)2—is formed as an intermediate in this decomposition reaction, and a substantial quantity of the nitrite can be found in the ash of low flame temperature mixtures. At higher reaction temperatures, the decomposition is 

This is a strongly endothermic reaction, with a heat of reaction of +92 kcal, and corresponds to an active oxygen content of 37.7%. Little ash is produced by this high-temperature process, which occurs in mixtures containing magnesium or other hot fuels. 

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Strontium has a valence of +2 and forms compounds that resemble the compounds of the other alkaline-earth metals (see Barium compounds Calcium compounds). Although many strontium compounds are known, there are only a few that have commercial importance and, of these, strontium carbonate [1633-05-2] SrCO, and strontium nitrate [10042-76-9], Sr(N03)2, are made in the largest quantities. The mineral celestite [7759-02-6], SrSO, is the raw material from which the carbonate or the nitrate is made. 

Strontium carbonate is the principal strontium compound consumed. Other commercial compounds include strontium nitrate and strontium hydrate. The latter is available in an anhydrous form or as the dihydrate or octahydrate form and is called strontium hydrate. 

There are two main processes for conversion of celestite, ie, strontium sulfate, to strontium carbonate. The principal process is the black ash process. Strontium nitrate is produced by dissolving celestite in nitric acid and purifying it. Most other strontium compounds are produced from strontium nitrate. To service this market, NOAH Technologies Corporation (San Antonio, Texas) has estabUshed a plant in Mexico to manufacture most commercial- and reagent-grade strontium compounds except strontium carbonate. 

Health and Safety Factors. The strontium ion has a low order of toxicity, and strontium compounds are remarkably free of toxic hazards. Chemically, strontium is similar to calcium, and strontium salts, like calcium salts, are not easily absorbed by the intestinal tract. Strontium carbonate has no commonly recognized hazardous properties. Strontium nitrate is regulated as an oxidizer that promotes rapid burning of combustible materials, and it should not be stored in areas of potential fire hazards. 

Strontium Nitrate. Strontium nitrate, Sr(N02)2, in the anhydrous form is a colorless crystalline powder with a melting point of 570—645°C... 

The principal use of strontium nitrate is in the manufacture of pyrotechnics (qv) as it imparts a characteristic, hrilliant crimson color to a flame. Railroad fusees and distress or rescue signaling devices are the main uses for strontium nitrate. It is also used to make red tracer bullets for the military. 

Strontium-gehalt, m. strontium content, -jodid, n. strontium iodide, -oxydhydrat, n. strontium hydroxide, -salpeter, m. strontium nitrate, -salz, n. strontium salt, -was-serstoff, m. strontium hydride. 

Zhai H, Hannon W, Hahn GS, Pelosi A, Harper RA, Maibach HI (2000) Strontium nitrate suppresses chemically induced sensory irritation in humans. Contact Dermatitis 42(2) 98-100... 

Example Feasible Region Determination and Rescaling. McLean and Anderson (9) described a mixture experiment in which magnesium (X ), sodium nitrate (X2), strontium nitrate (X3), and binder (X ) were combined and ignited to produce flares varying in intensity. The four components had the following ranges ... 

In the past, dissociation of the nucleoprotein complex has been brought about by salt solutions or by heat denaturation,129 but, more recently, decomposition has been effected by hydrolysis with trypsin,126 or by the use of dodecyl sodium sulfate130 or strontium nitrate.131 Some virus nucleoproteins are decomposed by ethyl alcohol.132 This effect may be similar to that of alcohol on the ribonucleoproteins of mammalian tissues. If minced liver is denatured with alcohol, and the dried tissue powder is extracted with 10% sodium chloride, the ribonucleoproteins are decomposed to give a soluble sodium ribonucleate while the deoxyribonucleoproteins are unaffected.133 On the other hand, extraction with 10 % sodium chloride is not satisfactory unless the proteins have first been denatured with alcohol. Denaturation also serves to inactivate enzymes of the tissues which might otherwise bring about degradation of the nucleic acid during extraction. 

Strontium compounds, 23 319-324 estimated distribution of, 23 3201 world production of, 23 319-320 Strontium cyanide, 8 197 Strontium ferrate (1 1), 5 598 Strontium fluoride, 23 323 Strontium fluoroborate tetrahydrate, 4 153 Strontium halides, 23 323 Strontium hexaferrite, 23 323 Strontium hydride, 13 613 Strontium hydroxide, 23 324 Strontium iodide, 23 323 Strontium-lead alloys, 14 779 Strontium minerals, 23 320 producers of, 23 319 Strontium nitrate, 23 319, 321, 323 Strontium oxide, 23 318, 324 Strontium peroxide, 18 396, 23 324 Strontium-silicon alloy, 22 520 Strontium sulfate, 23 322, 324 Strontium sulfide, 23 322 Strontium titanate... 

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