Precipitates, precipitation

Analyte Precipitant Precipitate Formed Precipitate Weighed... 

Precipitation gravimetry continues to be listed as a standard method for the analysis of Mg + and S04 in water and wastewater analysis. A description of the procedure for Mg + was discussed earlier in Method 8.1. Sulfate is analyzed by precipitating BaS04, using BaCb as the precipitant. Precipitation is carried out in an... 

Precipitation. Precipitation is the heart of the Bayer plant where recovery of the Al(OH)3 from process Hquors occurs in high yield and product quahty is controUed. The dominant use for Bayer Al(OH)2 is to calcine it into smelting grade alumina. 

In initial purification steps the goal is to obtain concentration with partial purification of the product, which is recovered either as a precipitate (precipitation), a solution in a second phase (liquid-liquid extraction), or adsorbed to solids (adsor ptiou, chromatography). 

Katz, J., "Electrostatic Precipitation." Precipitator Technology, Munhall, PA, 1979. 

OH- ions combine with ions of some metals to form insoluble metal hydroxides (precipitation). Precipitated metals settle out and thus are removed from the water adsorption, using activated carbon, improves this separation process. Iron is one of many metals which is commonly removed in this way. 

Chemical precipitation Precipitation induced by addition of chemicals the process of softening water by the addition of lime and soda ash as the precipitants. Chloramines Compounds formed by the reaction of hypochlorous acid (or aqueous chlorine) with ammonia. 

Aosfall, m. precipitation, precipitate falling out or off deficiency, deficit, loss breakdown, stoppage result sortie, attack (electric) shock. 

Polyacrylics are produced by copolymerizing acrylonitrile with other monomers such as vinyl acetate, vinyl chloride, and acrylamide. Solution polymerization may be used where water is the solvent in the presence of a redox catalyst. Free radical or anionic initiators may also be used. The produced polymer is insoluble in water and precipitates. Precipitation polymerization, whether self nucleation or aggregate nucleation, has been reviewed by Juba. The following equation is for an acrylonitrile polymer initiated by a free radical ... 

Crystallization takes place when the solute slowly comes out of solution as crystals, perhaps as the solvent evaporates. For example, salt crystals that form when water evaporates line the shores of the Great Salt Lake in Utah. In precipitation, a solute comes out of solution so rapidly that a single crystal does not have time to form. Instead, the solute forms a finely divided powder called a precipitate. Precipitation is often almost instantaneous (Fig. G.4). 

PRECP Precipitation Precipitation removes metal and inorganic solids from liquid wastes to allow the safe disposal of the hazardous solid portion... 

Table VI. Average Radionuclide Ratios in Precipitation Precipitation from Three Pacific Cyclones...

Precipitation. Precipitation as rain, snow, sleet, or hail is governed by movement of ah and is generally abundant wherever air currents are predominately upward. The greatest precipitation should therefore occur near the equator. The average annual rainfall in the United States is about 79 cm. 

Among some kinds of reactions which are slow on a relevant time scale and in particular environments are certain metal-ion oxidations, oxidation of sulfides, sulfate reduction, various metal ion polymerizations (e.g., vanadium, aluminum), aging of hydroxide and oxide precipitates, precipitation of metal-ion silicates and carbonates (e.g., dolomites), conversions among aluminosilicates (e.g., feldspar-kaolinite), and solution or precipitation of quartz (9). Some of these reactions can be accelerated greatly by biological catalysis (e.g., sulfate reduction, metal ion oxidations) (7). 

Chromium(m) Light green precipitate Precipitate dissolves... 

Cu2+(aq) Gelatinous blue precipitate Precipitate dissolves to give a deep blue solution... 

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