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Gravimetric microanalysis of berillium silicate rocks

The separation and quantitative determination of phosphoric acid and aluminium

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Mikrochemie

Summary

A micro method for the separation and gravimetric determination of aluminium and phosphoric acid was developed. The procedure was as follows. The phosphoric acid was precipitated as ammonium phosphomolybdate. In the filtrate the excess of molybdenum is first precipitated with hydrogen sulfide and then the aluminium with oxyquinoline. The ammonium phosphomolybdate is dissolved in ammonia and the phosphoric acid reprecipitated and weighed as magnesium ammonium phosphate.

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Literatur

  1. A. A. Benedetti-Pichler andF. Schneider, Mikrochemie,Emich-Festschrift, 1930.

  2. F. Pregl, Die quantitative organische Mikroanalyse, page 167 (Berlin 1930).

  3. Ausführung quantitativer Analysen, page 189 (Leipzig 1930). 8 grams of ammonium molybdate are dissolved in about 20 cc hot distilled water. This is then diluted with an aqueous solution of 20 grams of recrystallized ammonium nitrate (c. p.) to a volume of 50 cc. This mixture is slowly poured into 50 cc of a mixture of equal volumes of water and concentrated nitric acid with continuo us stirring. The reagent obtained is allowed to stand for a day and then filtered. One cc of this reagent contains 80 mg of ammonium molybdate.

  4. A. Benedetti-Pichler, Mikrochemie,Pregl-Festschrift (1929).

  5. A. A. Benedetti Pichler, Mikrochemie,Pregl-Festschrift, page 11 (1929).

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Authors and Affiliations

  1. Departement of Chemistry, Laboratory of Micro-chemistry, Washington Square College, New York University, New York, N. Y.

    Hilde Thurnwald & A. A. Benedetti-Pichler

Authors
  1. Hilde Thurnwald
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  2. A. A. Benedetti-Pichler
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Thurnwald, H., Benedetti-Pichler, A.A. Gravimetric microanalysis of berillium silicate rocks. Mikrochemie 9, 324–332 (1931). https://doi.org/10.1007/BF02714510

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  • DOI: https://doi.org/10.1007/BF02714510

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