Phosphate separation

The eluate was titrated to pH 7 with 0572N NaOH (63 ml). Removal of solvent left a gum, which was boiled with methanol (400 ml) for 20 minutes. The solid insoluble inorganic phosphate was filtered off and washed with methanol (200 ml). The slightly cloudy filtrate was filtered again, and evaporated to dryness in vacuo. The residual gum dissolved readily in water (40 ml) and on addition of acetone (600 ml) to the solution a mixture of sodium salts of hydrocortisone 21 -phosphate separated as a white solid. This was collected after 2 days, washed with acetone and dried at 100°C/0.1 mm/2 hrto constant weight. Yield4.45g. 

Karlson and Frankenberger [60] have developed a simple column ion-chromatographic column method for the determination of selenite in soil extracts with the simultaneous determination of chloride, nitrite, nitrate and phosphate. Separation of the anions was conducted on a low-capacity ion-exchange column, and anions were quantified by conductiometric detection. The eluent stream consisted of 1.5 mmol/1 phthalic acid and adjusted to pH 2.7 with formic acid. 

Zirconium nitrate reagent (for phosphate separations). Heat 10 g commercial zirconium nitrate, Zr0.(N03)2.2H20, and 100 ml 2m nitric acid to boiling under constant stirring. Allow to cool and set aside for 24 hours. Decant the clear liquid and use this for the tests. 

The linkage of the mj/o-inositol to the phosphatidic acid has not yet been determined with certainty the inositolphosphoric acid, isolated after hydrolysis of the intact phosphatide (or of the water-soluble portion, obtained by alkaline hydrolysis), gives, on paper chromatography, a mixture of inositol 1(3)-phosphate and a small proportion of inositol 2-phosphate (separated on paper by the method of Pizer and Ballou ). This indicates that, in the phospholipid, the m /o-inositol is probably linked by its C-1- or C-3-hydroxyl group to phosphoric acid. 

This chapter presents an overview of the crystal structures of inorganic compounds in which actinide polyhedra are directly coordinated by phosphate or arsenate tetrahedra. Arsenates are considered here for comparative purposes, because of the very similar structural roles played by arsenate and phosphate ions. Structural data are taken mainly from the Inorganic Crystal Stmcture Database [6] and the published literature. Entries from the Powder Dififtaction File of the International Centre for Diffraction Data [7] have been consulted in the case of compounds whose structures may reasonably be inferred. Mixed organic-inorganic compounds [8] and polyoxometalates are not addressed phosphites, phosphinates and arsenites also fall outside the scope of this chapter. Data are tabulated for a given structure type, with phosphates separated... 

Identification Talc is added to a melt of anhydrous sodium carbonate and anhydrous potassium carbonate and heated until fused. Hot water and hydrochloric acid are then added to the cooled mixture, and heated to dryness. The remaining solid is boiled in water, and the insoluble silica residue is filtered off. Ammonium chloride and ammonium hydroxide are dissolved in the filtrate. The solution is filtered if necessary and dibasic sodium phosphate TS is added to the filtrate. A white crystalline precipitate of magnesium ammonium phosphate separates. 

Fig. 3-91. Separation of various alkylphosphates and inorganic phosphates. - Separator column IonPac AS4A eluent 0.003 mol/L Na2C03 + 0.001 mol/L NaOH flow rate 2 mL/ min detection suppressed conductivity injection volume SO pL solute concentrations 60 ppm dibutylphosphate (technical grade) and 20 ppm orthophosphate.

Mannosylretinyl phosphate from dolichylman-nosil phosphate separation... 

A quantitative analysis of the phosphate separated on the paper was done by Smith s method (42). Lucena-Conde and Prat s reagent (43) was successfully employed for the colorimetric determination of orthophosphate or condensed phosphates eluted from the sheet of paper. 

An original technological solution for phosphate separation has been proposed in [157]. The typical flow-sheet requires rather high consumptions of anionic collectors, e.g. fatty acid soaps. The authors have proposed a two-step flow-sheet in which fine particles are first floated with a minimum aminoacid consumption. The concentrate from prefloat is then floatated with a fatty acid/fuel oil emulsion. As a result, a phosphorite concentrate is produced which contains about 30 % P2O5, and the P2O5 recovety is over 93%. 

Patthy, M., Balia, T. and Aranyi, P. (1990) High-performance reversed-phase ion-pair chromatographic study of myo-inositol phosphates separation of myo-inositol phosphates, some common nucleotides and sugar phosphates. Journal of Chromatography A 523, 201-21 5. 

Botation of calcareous and dolomitic phosphate ores seems to be the most economically viable technical alternative. However, selective flotation of carbonates from phosphate is rather difficult due to the similarity in the physico-chemical properties of carbonate and phosphate minerals. Carbonatc/phosphate separation by flotation is commercially used in Finland and Braal to treat igneous phosphate ores. 

Ground phosphate rock is not classified as a fertilizer in most countries and is not included in fertilizer consumption statistics reported by most countries. However, FAO reports consumption of ground rock phosphate separately in 1976 reported consumption was... 

Figure 3.178 Separation of various alkylphos-phates and inorganic phosphates. Separator column lonPac AS4A-SC eluent 3 mmol/L Na2C03 -I-1 mmol/L NaOH flow rate 2 ml7 min detection suppressed conductivity ...

Figure 3.179 Separation of a- and (3-glycero-phosphate. Separator column lonPac AS4A-SC eluent 0.85 mmol/L NaHCOs + 0.9 mmol/L Na2C03 flow rate 2 mL/min detection ...

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