Of miscellaneous metals

Haarich et al. [ 811 ] applied total reflection X-ray fluorescence spectrometry to the determination of a wide range of miscellanous metals in seawater. 

Hazardous properties, including toxicity, flammability, and explosive reactions of miscellaneous metal alkyls are presented in Table 32.2. 

GENETIC TOXICITY TESTING OF MISCELLANEOUS METAL IONS... 

Miscellaneous Samples Besides environmental and clinical samples, differential pulse polarography and stripping voltammetry have been used for the analysis of trace metals in other samples, including food, steels and other alloys, gasoline, gunpowder residues, and pharmaceuticals. Voltammetry is also an important tool for... 

Miscellaneous. Hydrochloric acid is used for the recovery of semiprecious metals from used catalysts, as a catalyst in synthesis, for catalyst regeneration (see Catalysts, regeneration), and for pH control (see Hydrogen-ION activity), regeneration of ion-exchange (qv) resins used in wastewater treatment, electric utiUties, and for neutralization of alkaline products or waste materials. In addition, hydrochloric acid is also utilized in many production processes for organic and inorganic chemicals. 

Precautions. Care should be taken not to impair the quaUty of the metal as a result of the melting operation. The best practice is to select scrap of known good quaUty. The use of miscellaneous scrap may not be economical, despite the lower cost of such material however, it is not common practice to make much use of virgin metals. 

Compiled from the following reports of the U.S. Department of Interior, Bureau of Mines Rl 5753, The Explosibility of Agricultural Dusts Rl 6516, Explosibility of Metal Powders Rl 5971, Explosibility of Dusts Used in the Plastics Industry Rl 6597, Explosibility of Carbonaceous Dusts Rl 7132, Dust Explosibility of Chemicals, Drugs. Dyes and Pesticides and Rl 7208, Explosibility of Miscellaneous Dusts.)... 

The end-use pattern of trichloroethylene in the United States was estimated as follows (CMR 1986) vapor degreasing of fabricated metal parts, 80% chemical intermediates, 5% miscellaneous uses, 5% and exports, 10%. The most important use of trichloroethylene, vapor degreasing of metal parts, is closely associated with the automotive and metals industries (CMR 1983). 

A large number of miscellaneous characteristics are usually included in many official compendia to ascertain the purity, authenticity and identification of drugs—including sulphated ash, loss on drying, clarity and colour of solution, presence of heavy metals and specific tests. 

Miscellaneous. A number of reports of the synthesis of unusual heterocyclic phosphines have appeared. Improved procedures for the synthesis of l,3,5-triaza-7-phospha-adamantane (48) have been reported,40-41 and the triazaphosphahomo-adamantane (49) has also been prepared.42 Routes to the large ring phosphacyclo-alkanes (50) have been described,43 and the bicyclic diphosphine (51) has been isolated from the reaction of white phosphorus with o-dichlorobenzene in the presence of transition-metal halides.44... 

A variety of miscellaneous elements can also occur in a residual fuel oil fraction. For example, chlorine is present as a chlorinated hydrocarbon and can be determined (ASTM D808, D1317, D6160). A rapid test method suitable for analysis of samples by nontechnical personnel is also available (ASTM D5384) and uses a commercial test kit where the oil sample is reacted with metallic sodium to convert organic halogens to halide, which is titrated with mercuric nitrate using diphenyl carbazone indicator. Iodides and bromides are reported as chloride. 

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