Strontium nitrate, preparation

Yang YJ, Wen T-L, Tu H, Wang D-Q, and Yang J. Characteristics of lanthanum strontium chromite prepared by glycine nitrate process. Solid State Ionics 2000 135 475 t79. 

Strontium nitrate is prepared hy treating strontium carbonate with nitric acid. The solution is evaporated and crystallized ... 

Strontium nitrate, for preparation of strontium sulfate or strontium selenite, 3 17 Strontium selenide, 3 20 phosphors, 3 11, 22 Strontium selenite, for preparation of strontium selenide, 3 20 Strontium sulfate, for preparation of strontium sulfide, 3 19 Strontium sulfide, 3 20 phosphors, 3 11, 21, 23 Structure, of 1,3-diketones, 2 10 electronic, of rare earth elements, 2 30... 

A. Ihre prepared barium mesoperiodate, Ba3(I05)2, and also strontium meso-periodate, Sr3(I05)2, by adding ammonia to a dil. aq. soln. of sodium metaperiodate, and dropping the mixture into a soln. of barium or strontium nitrate as the case might be 3Sr(N03)2+2Na4l209=Sr3(I05)2+2NaI04+6NaN03. 

Manufacture. Strontium carbonate is prepared firsttsee(9) J and then nitric acid is added to it to produce strontium nitrate. Strontium and barium are similar chemically so the industrial purification of strontium nitrate is a difficult problem. At present there are three ways to separate the nitrates of strontium and bariumC. /f/f(i.o)... 

The solubility of SrSe04(cr) in water has been determined over the temperature interval 273 to 373 K. Crystalline strontium selenate was prepared by mixing stoichiometric amounts of strontium nitrate and selenic acid. Under the light microscope the crystals appear as very thin needles. The strontium concentration in saturated solution was obtained by polarographic (half-wave potential at -2.1 V) and gravimetric measurements. Both methods gave concordant results, Table A-18. 

Preparation of materials. Materials are prepared for mixing into compositions by several processes pulverizing, sieving, drying etc. Pulverized barium or strontium nitrate consolidates into a hard mass over a period of time. These substances are dried above 100°C and stored in a moistureproof container, e.g. a steel drum. Nitrates are sometimes placed in a iron pan and heated over a direct heat with constant stirring. It is not dangerous unless a combustible material is added to it. It should be stirred with a spatula made of incombustible material such as aluminium. 

Under favorable circumstances, an initial precipitation reaction can be selected that will separate the radionuclide of interest from most contaminants. An example from the group separations in Table 3.2 is the precipitation of strontium nitrate in concentrated nitric acid. The element of interest may be accompanied by several other elements, usually in the same periodic group, as indicated in the table. Barium and radium nitrate, for example, are also insoluble. If such specific precipitation reactions can be applied directly, the only additional processes will be separation from these similar elements and preparation of the counting source. 

Some of the procedures outlined below have been described previously. " They are designed for the preparation of phosphors that are to be used for quantitative studies of luminescence. Details are presented for the preparation of strontium nitrate, strontium chloride, strontium sulfate, and strontium selenite in a state of high purity for the reduction of the sulfate to the sulfide and the selenite to the selenide and for the conversion of the sulfide and the selenide into typical infrared-sensitive phosphors. 

Strontium Selenite. A solution of 77 g. of sublimed selenium(IV) oxide in 154 ml. of distilled water is added to 500 ml. of pure strontium nitrate solution prepared as previously described. The solution is heated to boiling and fresh ammonium hydroxide solution is added until no further precipitation of strontium selenite occurs. The precipitate is drained and washed six times with 300-mI. portions of hot distilled water. The nitrate content should be less than 5 parts per million as determined by the diphenylamine-sulfuric acid test. The strontium selenite is dried at 200° for several hours. The yield is about 125 g. 

In our case, Lao,66Sro,33Mn03 was prepared with lanthanum nitrate, lanthanum acetate and lanthanum chloride. After dissolution in water, they were mixed with manganese acetate and strontium nitrate, and then stirred for half an hour. A gel formed after addition of citric acid which protonates the ligands. Ethylene glycol was used for esterification and to improve solubility. Finally ammonium hydroxide was added for peptization, followed by stirring for 1 h. 

OC-Hydroxycarboxylic Acid Complexes. Water-soluble titanium lactate complexes can be prepared by reactions of an aqueous solution of a titanium salt, such as TiCl, titanyl sulfate, or titanyl nitrate, with calcium, strontium, or barium lactate. The insoluble metal sulfate is filtered off and the filtrate neutralized using an alkaline metal hydroxide or carbonate, ammonium hydroxide, amine, or alkanolamine (78,79). Similar solutions of titanium lactate, malate, tartrate, and citrate can be produced by hydrolyzation of titanium salts, such as TiCl, in strongly (>pH 10) alkaline water isolation of the... 

Palladium catalysts resemble closely the platinum catalysts. Palladium oxide (PdO) is prepared from palladium chloride and sodium nitrate by fusion at 575-600° [29,30]. Elemental palladium is obtained by reduction of palladium chloride with sodium borohydride [27, 31], Supported palladium catalysts are prepared with the contents of 5% or 10% of palladium on charcoal, calcium carbonate and barium sulfate [32], Sometimes a special support can increase the selectivity of palladium. Palladium on strontium carbonate (2%) was successfully used for reduction of just y, (5-double bond in a system of oc, / , y, (5-unsaturated ketone [ii]. 

Strontium oxide is prepared by thermal decomposition of strontium carbonate, hydroxide, or nitrate ... 

Cement, laboratory, 1 189 Cerite, extraction of, 2 44 Cerium, phosphor containing strontium sulfide and, 3 23 separation of, from rare earth mixtures, 2 43, 47, 48 test for, 2 50 Cerium amalgam, 1 15 Cerium-group earths, separation of, from yttrium earths by doublesulfate method, 2 44, 46 Cerium (III) magnesium nitrate, 2Ce(N03)s-3Mg(N03)2-24H,0, separation of praseodymium from lanthanum by, 2 57 Cerium(III) nitrate, 2 51 Cerium (IV) nitrate, basic, 2 49 Cesium, cesium azide for preparation of, 1 79... 

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