Barium organic compounds

Sodium and potassium hydroxides. The use of these efficient reagents is generally confined to the drying of amines (soda lime, barium oxide and quicklime may also be employed) potassium hydroxide is somewhat superior to the sodium compound. Much of the water may be first removed by shaking with a concentrated solution of the alkali hydroxide. They react with many organic compounds (e.g., acids, phenols, esters and amides) in the presence of water, and are also soluble in certain organic liquids so that their use as desiccants is very limited... 

Impurities in bromine may be deterrnined quantitatively (54). Weighing the residue after evaporation of a bromine sample yields the total nonvolatile matter. After removing the bromine, chloride ion may be deterrnined by titration with mercuric nitrate, and iodide ion by titration with thiosulfate water and organic compounds may be detected by infrared spectroscopy sulfur may be deterrnined turbidimetricaHy as barium sulfate and heavy metals may be deterrnined colorimetricaHy after conversion to sulfides. 

Contact of barium peroxide and water will readily produce a temperature and a local oxygen concentration high enough to ignite many organic compounds. 

Why are barium- and iodine-based materials selected for contrast media The production of X-ray images depends on the differences between the X-ray absorbing power of various tissues. This difference in absorbing power is called contrast and is directly dependent on tissue density. To artificially enhance the ability of a soft tissue to absorb X-rays, the density of that tissue must be increased. The absorption by targeted soft tissue of aqueous solutions of barium sulfate and iodized organic compounds provides this added density through the heavy metal barium and the heavy nonmetal iodine. 

The CFX MiniFix technology can treat solids, sludges, and most liquids. The treatment is applicable to a variety of heavy metals such as aluminum, antimony, arsenic, barium, beryllium, cadmium, chromium, hexavalent chromium, iron, lead, manganese, mercury, nickel, selenium, silver, thallium, and zinc. The technology also treats organic compounds with high molecular weights. 

There are hardly any reports on the use of magnesium and barium fluoride for introducing fluorine into organic compounds. Calcium fluoride is used along with alkali metal or other metal fluorides to assist and enhance the incorporation of fluorine. 

Physical and Chemical Properties. The physical and chemical properties of metallic barium and its inorganic compounds have been well characterized (DOT 1986 EPA 1980a, 1984, 1985c, 1987d Hawley 1981 Hayes 1982 HSDB 1989 Kirkpatrick 1985 Kunesh 1985 Meister 1989 NIOSH/OSHA 1978 OHM/TADS 1989 Parmeggiani 1983 Perry and Chilton 1973 RTECS 1989 Sax and Lewis 1987, 1989, Sax et al. 1984 Stokinger 1981 Weast 1989 Windholz 1983). Physical and chemical properties of organic compounds of barium have not been comprehensively examined... 

It has been proposed that mediated electrochemical oxidation may be used for the ambient temperature destruction of hazardous waste. Using Co(III)- -mediated electrochemical oxidation in sulfuric acid, l,3-dichloro-2-propanol and 2-chloro-l-propanol were oxidized to carbon dioxide259. A series of studies is being conducted on the use of the anodic oxidation of barium peroxide to produce an intermediate that leads to destruction of halogenated organic compounds. 

A hydrate of barium hydroxide, Ba(0H)2-xH20, is used to make barium salts and to prepare certain organic compounds. Since it reacts with C02 from the air to yield barium carbonate, BaC03, it must be stored in tightly stoppered bottles. 

B. S. T. Ioffe and A. N. Nesmeyanov, The Organic Compounds of Magnesium, Beryllium, Calcium, Strontium and Barium. North-Holland, Amsterdam, 1967. 

There are alternative ways of modifying the matrix to remove the interference. Organic compounds have been shown to be effective. Regan and Warren [41] studied potential interferences on lead determinations in water. 100 mg l-1 of calcium, magnesium, strontium and barium were added to lead solutions in hydrochloric acid and nitric acid. The most severe interferences... 

A similar accelerating effect is exerted by other substances, such as potassium ferricyanide, potassium permanganate, potassium chromate,6 sodium peroxide,6 barium peroxide,7 cyanogen bromide,8 cyanogen chloride,9 persulphates, and certain organic compounds.10 The best method of reducing the proportion of the other metals is to maintain the cyanide solution dilute. 

Calcium, Strontium, and Barium,57 The organic compounds of these metals are of little synthetic use compared to the magnesium compounds. The most interesting and best studied are the cyclopentadienyls and related compounds.58 These can be... 

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