Ammonium pyrophosphates pyrophosphate

A large number of pyrophosphate salts have been prepared (Table 10). In addition to individual metal salts, ammonium pyrophosphates and many mixed-metal pyrophosphates are known. Pyrophosphates of notable commercial importance include sodium, potassium, and calcium salts. 

Tris(tetra-n-buty (ammonium) hydrogen pyrophosphate, 1(ihC4H,)4N]3HP207 (1). Mol. wt. 417.42. The salt is prepared by treatment of Na2H,P,07 (Stauffer) with an acidic ion-exchange resin and then with tetra-n-butylammonium hydroxide. 

Delobel, R., Le Bras, M., Ouassou, N., and Alistiqsa, F. 1990. Thermal behaviors of ammonium polyphosphate-pentaerythritol and ammonium pyrophosphate-pentaerythritol intumescent additives in polypropylene formulations. J. Fire Sci. 8 85-92. 

Ammonium pyrophosphates.—Excess of ammonia reacts with pyrophosphoric acid to form normal ammonium pyrophosphate, (NH4)4P207, precipitated from aqueous solution by addition of alcohol. It forms crystalline laminae, dissolving very readily in water to a solution of alkaline reaction.7 When boiled, this solution evolves ammonia, yielding am acid solution of secondary ammonium pyrophosphate, (NH4)2H2P207. 

Ammonium Chromi-pyrophosphate, NHt(CrP202).6H20, yields grey microscopic columns. 

A variety of crystals may be present in the urine, including uric acid, calcium oxalate, calcium phosphate, calcium magnesium ammonium pyrophosphate, and cystine. Many of these have a unique crystalline form which permits them to be identified with microscopy. 

CAS 10101-66-3 EINECS/ELINCS 233-257-4 Synonyms Ammonium manganese pyrophosphate Cl 77742 Diphosphoric acid, ammonium manganese (3+) salt (1 1 1) Manganese ammonium pyrophosphate Pigment violet 16 Classification Inorganic salt Empirical H4O7P2 H N Mn Toxicology TSCA listed... 

Manganese ammonium pyrophosphate. See Manganese violet Manganese aspartate CAS 16351-10-3... 

Where specification of the metal is considered to be important, polarographic analysis may be utilized. In the case of primers based on oil-soluble iron salts for use with anaerobic adhesives, the Fe /Fe ratio may be determined by differential pulse polarography in a supporting electrolyte based on ammonium pyrophosphate buffer adjusted to pH 9.0. The iron(II) form is known to be significantly more effective than the iron(III) form in the redox-based curing process. 

Ammonium pyrophosphates are obtained by passing ammonia into pyrophosphoric acid below 10°C. Precipitation with alcohol at 0°C and pH 6.5 gives crystalline (NH4)4P207 H2O, and the anhydrous compound at 25°C, both of which slowly lose ammonia to the atmosphere. 

Cobalt orthojiiosphate Manganese ammonium pyrophosphate Zinc phosphate Lead phosphates... 

Fig. 10. Nomograph for estimating the rate of hydrolytic degradation of pyrophosphate and tripolyphosphate (tetramethyl ammonium salts) (27). For...

The most common plafing bath uses fluoride to complex the fin. A typical solution contains 45 g/L staimous chloride, 300 g/L nickel chloride hexahydrate, and 55 g/L ammonium bifluofide. It is operated at pH 2.0—2.5 usiag ammonium hydroxide temperature is 65—75°C and current about 200 A/m. The bath has excellent throwing power. Air agitation is avoided. The deposit is bright without additives. Anodes are cast nickel, and the fin is replenished by additions of staimous chloride. AHoy anodes of 72% fin have been used to a much lesser extent. Tia-nickel deposits are covered by ASTM (136) and ISO (137) specifications. One other bath based on pyrophosphate has appeared ia the Hterature, but does not seem to be ia commercial use. 

Geranyl pyrophosphate [763-10-0 (NH4 salt)] M 314.2, pKeski)-<2, pKesi(2) <2, pKesK3)-3.95, PKesi(4) 6.26. Purified by paper chromatography on Whatman No 3 MM paper in a system of isopropyl aleohol/isobulyl aleohol/ammonia/waler (40 20 1 39), Rp 0.77-0.82. Stored in the dark as the ammonium salt at 0°. 

Phosphoribosyl pyrophosphate synthetase (from human erythrocytes, or pigeon or chicken liver) [9015-83-2] Mr 60,000, [EC 2.7.6.1]. Purified 5100-fold by elution from DEAE-cellulose, fractionation with ammonium sulfate, filtration on Sepharose 4B and ultrafiltration. [Fox and Kelley J Biol Chem 246 5739 197h, Flaks Methods Enzymol6 158 1963 Kornberg et al. J Biol Chem 15 389 7955.]... 

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