Ammonium hydrogen phosphate

C03-0103. Four commonly used fertilizers are NH4 NO3 (ammonium nitrate), (NH4)2 SO4 (ammonium sulfate), (NH2)2 (urea), and (NH4)2 HPO4 (ammonium hydrogen phosphate). How many kilograms of each of these would be required to provide 1.00 kg of nitrogen ... 

Pruszkowska et al. [135] described a simple and direct method for the determination of cadmium in coastal water utilizing a platform graphite furnace and Zeeman background correction. The furnace conditions are summarised in Table 5.1. These workers obtained a detection limit of 0.013 pg/1 in 12 pi samples, or about 0.16 pg cadmium in the coastal seawater sample. The characteristic integrated amount was 0.35 pg cadmium per 0.0044 A s. A matrix modifier containing di-ammonium hydrogen phosphate and nitric acid was used. Concentrations of cadmium in coastal seawater were calculated directly from a calibration curve. Standards contained sodium chloride and the same matrix modifier as the samples. No interference from the matrix was observed. 

A rapid digestion of vegetable tissue with nitric-perchloric acid mixture was followed by ETAAS using ammonium hydrogen phosphate as matrix modifier. Recovery of Pb was complete at the ppm level with RSD < 4%47. 

Speciation calculations can be performed for the weak acids and bases in a feshion similar to that presented earlier for Fe(III). The results of these calculations as a function of pH are shown in Figure 5.19. At the pH of seawater, the dominant species are carbonate, bicarbonate, ammonium, hydrogen phosphate, dihydrogen phosphate, and boric and silicic acid. In waters with low O2 concentrations, significant concentrations of HS can be present. 

Reaction with ammonium hydrogen phosphate yields cobalt(ll) phosphate ... 

Because large magnitudes of broadening were observed in PTFE, even for slowly cooled specimens, it was necessary to use line-width standards. The two materials used were annealed LiF and a diluted solid mixture of ammonium hydrogen phosphate. Data analysis proceeded by Fourier analysis of multiple orders, the well-known Warren-Averbach procedure. " Values of the domain size as measmed experimentally and with a correction using renormalized cosine coefficients (RCC), are given in Table 1.2. 

Sodium ammonium hydrogen phosphate [13011-54-6] M 209.1. Crystd from hot water (Iml/g). 

Salts therefore, are prepared (1) from solutions of acids and bases by neutralization and separation by evaporation and crystallization (2) from solutions of two salts by precipitation where the solubility of the salt formed is slight (e.g., silver nitrate solution plus sodium chloride solution yields silver chloride precipitate [almost all as sulid], and sodium nitrate present in solution as sodium cations and nitrate anions [recoverable as sodium nitrate, solid by separation of silver chlondc and subsequent evaporation of the solution]) (3) from fusion of a basic oxide (or its suitable compound—sodium carbonate above) and an acidic oxide (or its suitable compound—ammonium phosphate), since ammonium and hydroxyl are volatilized as ammonia and water. Thus, sodium ammonium hydrogen phosphate... 

Phosphate (or microcosmic salt) bead tests The bead is produced similarly to the borax head except that microcosmic salt, sodium ammonium hydrogen phosphate tetrahydrate Na(NH4)HP04.4H20, is used. The colourless, transparent bead contains sodium metaphosphate ... 

Sodium metaphosphate, NaPOs.—The metaphosphate is prepared by the interaction of sodium nitrate and phosphoric acid at 330° C.20 It is a white, vitreous mass, almost insoluble in water, and melting21 at 617 2° C. It is sometimes called Maddrell s salt, after its discoverer.22 The semihydrate, NaP03, H20, is formed by heating sodium ammonium hydrogen phosphate at 160° to 170° C., and subsequently raising the temperature to 320° C.23 Tammann24 has proved the existence... 

The most important of the double salts of phosphoric acid with ammonium and the alkali-metals is sodium ammonium hydrogen phosphate or microcosmic salt, NaNH4HP04,4H20, a constituent of putrefying urine, and also present in guano under the name stercorite.17 It can be prepared by the interaction of secondary sodium phosphate and ammonium chloride, or that of secondary ammonium phosphate and sodium chloride. It forms colourless columnar crystals belonging... 

Colloidal ferric phosphate is obtained by dissolving ferric phosphate in ammoniacal di-ammonium hydrogen phosphate and dialysing the solution until all electrolytes have been washed away. The colloidal solution thus obtained is tasteless and without action on litmus. Addition of electrolytes, such as alkali chlorides, effects its gelatmisation. 

NH6P04 ammonium dihydrogen phosphate 7722-76-1 25.00 1.7980 1 2887 NaHl3N08P sodium ammonium hydrogen phosphate tetrahydrate 13011-54-6 25.00 1.5400 1... 

HPLC on pBondapak Ph column with UV detection at 280 nm has been used for the determination of sulfacetamide, sulfabenzamide and sulfathiazole in a triple sulfa cream. The mobile phase consists of a 7 3 mixture of 0.01 M ammonium hydrogen phosphate and methanol (pH 7.2). The proposed method has been shown to give better results for sulfacetamide assay compared with those of the USP method (97). Sulfacetamide, sulfadiazine, sulfamerazine and sulfamethazine in mixtures and in pharmaceuticals have been determined by HPLC using a nonpolar column with methanol-0.02 M potassium dihydrogen phosphate in water as the mobile phase and a variable wavelength UV detector. The method is precise with relative standard deviations of 2.1, 0.6,1.9 and 1.6% respectively for the four compounds. The preservatives do not interfere with the method (98). 

Hanks et al. analyzed nicotine-containing pesticides by means of an octadecyl column with methanol - 0.05 M ammonium hydrogen phosphate (pH 7.5) (3 2) as mobile phase. 

A further refinement which is now commonly used is to commence dyeing with 2 to 5 per cent of ammonium phosphate, or an ammonium hydrogen phosphate, so that the liberation of phosphoric acid shall be gradual. 

Write the formulas that correspond to the following names (a) aluminum oxide (used to waterproof fabrics), (b) cobalt(III) fluoride (used to add fluorine atoms to compounds), (c) iron(II) sulfate (in enriched flour), (d) ammonium hydrogen phosphate (coats vegetation to retard forest flres), and (e) potassium bicarbonate (in Are extinguishers). 

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