Barium Calcium Silicon

Barium, calcium, silicon, with a trace of sulfur... 

Two other similar cases were subsequently experienced and as a consequence it was decided to act on the side of safety by reclassifying barium, calcium, silicon particles as indicative, rather than unique, to the discharge of a firearm. 

From casework statistics the unique particles (those containing the combination lead, antimony and barium, and those containing antimony and barium) occur in the ratio 7 3, respectively. Approximate percentages for indicative particles are lead-only 55% lead, antimony 20% lead, barium 8% antimony-only 7% barium, calcium, silicon 5% barium-only 5%. Table 19.3 gives an indication of the levels of the primary elements in each particle type. Table 19.4 gives an indication of the levels of accompanying elements in each particle type and is the basis for note b in Table 19.5, Particle Classification Scheme. 

Preparation of Red-Emitting Eu NDoped Barium Calcium Silicon Oxynitride by Solid-State Reaction and its Luminescence Properties... 

Keywords Barium calcium silicon oxynitride. Luminescence, Red color light emission... 

Calcium—Silicon. Calcium—silicon and calcium—barium—siUcon are made in the submerged-arc electric furnace by carbon reduction of lime, sihca rock, and barites. Commercial calcium—silicon contains 28—32% calcium, 60—65% siUcon, and 3% iron (max). Barium-bearing alloys contains 16—20% calcium, 9—12% barium, and 53—59% sihcon. Calcium can also be added as an ahoy containing 10—13% calcium, 14—18% barium, 19—21% aluminum, and 38—40% shicon These ahoys are used to deoxidize and degasify steel. They produce complex calcium shicate inclusions that are minimally harm fill to physical properties and prevent the formation of alumina-type inclusions, a principal source of fatigue failure in highly stressed ahoy steels. As a sulfide former, they promote random distribution of sulfides, thereby minimizing chain-type inclusions. In cast iron, they are used as an inoculant. 

In 1978, on the basis of a few measurements of urine calcium and phosphate excretion as well as an awareness of the previously mentioned work regarding the amounts of calcium and phosphate normally accreted in utero and postnatally, it became apparent that the demineralization, fractures and rickets we were seeing in our infants were caused by calcium deficiency. Consequently we increased the amount of calcium added to the parenteral alimentation solutions. If more than 12.5 mM of the calcium were added to a liter of hyperalimentation solution, gross precipitation would occur in the feeding solution. If 10 mM of calcium were added per liter, crystalline precipitated began to build up on the inside of our barium-impregnated silicone rubber central venous catheters. This crystalline precipitate resulted in gradual occlusion and functional loss of these lines. After several false starts and six lost catheters, chemical and crystal analysis showed that the precipitate inside these catheters was CaHPO. ... 

Barium- and calcium-bearing manganese silicon is used as an inoculant in gray and ductile iron. The alloy contains 60—65% Si, 9—11% Mn, 4—6% Ba, 1—3% Ca, and 1—1.5% Al. The combination of barium, calcium, and manganese provides excellent chill reduction, improves the graphite structure, and minimizes section sensitivity in castings having thin and thick sections. 

In steelmaking applications, calcium disilicide has hitherto been generally more widely used than calcium metal. Total consumption of calcium disilicide in the steel industry worldwide is estimated to be about 6000 tons (30% Ca). Principal producers are Pechiney Electrometallurgie of France and SKW Trostberg of Germany. In the United States, the Norwegian company Elkem Metal produces up to 2500 metric tons of calcium disilicide. Also produced are CalSiBar, a calcium—silicon—barium alloy, and Hypercal, a calcium—silicon—barium—aluminum ferroalloy. 

Analysis of particles originating from the use of outdoor fireworks revealed that the majority of the particles was irregular, many were crystalline, and many large flakes were present. A small proportion of the particles were spherical and physically resembled FDR particles. Elemental analysis showed the presence of aluminum, arsenic, barium, calcium, chlorine, copper, iron, potassium, magnesium, sodium, lead, sulfur, antimony, silicon, strontium, titanium, zinc, and zirconium. None of the particles detected would be confused with FDR particles as the primary FDR elements were always accompanied by elements that were clearly of non-FDR source. 

In flameless atomic absorption the analyte often tends to react with the graphite furnace or rod to form carbides. In such cases atomisation is suppressed. Release agents are used to react preferentially with the graphite releasing the analyte on atomisation. An application of this is in the determination of aluminium, barium, beryllium, silicon and tin. A large enhancement of the signal has been observed [47] when calcium (as the nitrate) is added to the analytical solutions. This has been suggested as due to a reduction in the formation of carbide in the presence of calcium. A calcium level of 1000 to 2000 mg l-1 in the solutions has been reported as the optimum in most cases. 

Table 15.6. Calculation Summary for the Elements Phosphorus, Silicon, Barium, Calcium., Sulfur, and Sodium...

A standard wet chemical analysis (ASTM D-811) is available for determination of aluminum, barium, calcium, magnesium, potassium, silicon, sodium, tin, and zinc. The procedure involves a series of chemical separations with specific elemental analysis performed by using appropriate gravimetric or volumetric analyses. 

LEAD MONOXIDE (1317-36-8) A strong oxidizer. Explosive reaction with 90% peroxy-formic acid, rubidium acetylide. Reacts violently with strong oxidizers, boron, chlorine, fluorine, dichloromethylsilane, calcium sulfide, hydrogen peroxide, hydrogen trisulfide (ignition), hydroxylamine (ignition), lithium carbide, metal acetylides, metal powders (e.g., aluminum, molybdenum, zirconium, etc.), perchloric acid, red phosphorus, selenium oxychloride, sodium. Incompatible with aluminum carbide, barium sulfide, silicon, sulfuryl chloride. Forms impact-sensitive explosive mixtures with dichloromethylsilane. May attack plastics, coatings, and chlorinated rubber materials such as Hypalon , Parlon , Rutile , and fluorinated rubbers such as Viton . 

Minerals and vitamins are usually found in BSG [27]. The mineral elements include aluminum, barium, calcium, chromium, cobalt, copper, iron, magnesium, manganese, phosphorus, potassium, selenium, silicon, sodium, strontium, sulfur, and zinc, typically all in concentrations lower than 0.5%, except for silicon that is the major mineral present. The vitamins include biotin, choline, folic acid, niacin, pantothenic acid, riboflavin, thiamine, and pyridoxine. Although, many of the vitamins can be destroyed during the hydrolysis... 

Barium chlorate Barium nitrate Bismuth Calcium chlorate Calcium nitrate Calcium phosphide Calcium silicon Camphor L-Camphor Copper carbonate (ic)... 

Phytochemistry The leaves contain tannins, caffeic, oleanolic, ursolic acids, and essential oil (including citral, citronellol, myrcene, and geraniol). The aboveground parts contain ascorbic acid, potassium, calcium, magnesium, iron, manganese, copper, zinc, molybdenum, chromium, aluminium, barium, tungsten, silicon, nickel, sulfur, lead, and selenium. The seeds contain fatty oil (Volinsky et al. 1983 Camat et al. 1998 de Sousa et al. 2004 Maznev 2004). 

Boron Aluminum Oxygen e Calcium Barium o Silicon... 

Oxygen — Silicon Barium - Calcium — —Aluminum — — Boron... 

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