SU449279A1 - The method of deposition of beryllium from solutions - Google Patents

Description

(54) METHOD FOR DEPOSITING BERILLY FROM SOLUTIONS

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This invention relates to analytical chemistry.

Methods are known for precipitating beryllium from solutions with inorganic and organic reagents, preferably for its subsequent analytical determination. As organic reagents, it is known to use β-diketones, 8-hydroxy-napin and its derivatives of fexylhydroxypamia derivatives, etc.

In order to increase the selectivity of the process, precipitation is suggested to be carried out from a medium with a pH of 1.9-2.5 with disubstituted nitrile trimethylphosphonic acid salt, for example, disodium salt.

Due to the fact that beryllium forms with nitrile trimethylphosphonic acid (And L)

amorphous precipitate, precipitation is better to carry out: from a concentrated concentrated solutions of beryllium salts (chloride, sulfate, nitrate) with a 1.5-fold excess of reagent. Deposition in an acidic environment makes it possible to eliminate the effect of 100-fold amounts of elements of the AND group — magnesium, calcium, strontium, and barium. Forming a compound has a weight form of WDMN (), -.

with a molecular weight of 818. Analytical multiplier for weight analysis:

GWe / BedSnI) 10H20 0.0550 FBeO / Beg (НЬ) а10НгО 0.1528.

The acidic medium during the precipitation is created with buffer solutions, which use mixtures of sodium citrate, glycine, potassium hydrophthalate, potassium chloride, ammonium chloride with hydrochloric acid.

Example. K5 ml of a beryllium chloride solution containing 2–20 mg of the element is added 10 ml of a citrate buffer solution of pH 2.2, heated to boiling and 10 ml of a 0.1 M aqueous solution of the diammonium salt of nitrile trimethylphosphonic acid are added precipitator for every 5 mg of beryllium). The mixture obtained is diluted to 6 ml.

2. 449279

: dihydrate: buffer solution and reheat for 4 min. The precipitate was quantitatively transferred to a No. 4 glass filter, washed with 5Q ml of water, then 100 ml of a mixture of water and an adheton (1: 1) to a negative reaction to chlorine ion. The precipitate is brought to constant weight in a vacuum desiccator over phosphorus pentoxide. Typically, a single 20 minute pumping out is sufficient to completely dry the precipitate, o Relative error in determining irO, 16%.

Subject invention

The method of sedimentation of beryllium from solutions with organic reagents, mainly for its subsequent analytical determination, not only 4TOi, in order to increase the electoral efficiency of the process, the precipitation is carried out from a medium with a pH of 1.9-2.5. disubstituted salt nitrilotrimethylphosphonic acid, for example disodium.