ISO/TC 47 Chemie,
ISO/TC 47 Chemistry,
ISO/TC 47 Chimie,
ISO Internationale Organisation für Normung,
ISO International Organization for Standardization,
ISO Organisation Internationale de Normalisation
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Media type:
Standard
Title:
ISO 3706
:
Phosphoric acid for industrial use (including foodstuffs); Determination of total phosphorus(V) oxide content; Quinoline phosphomolybdate gravimetric method
Other titles:
Phosphorsäure für Industriezwecke (einschließlich Lebensmittel); Bestimmung des Gesamtphosphor-(V)-Oxidgehaltes; gravimetrisches Quinolinphosphormolybdatverfahren
Acide phosphorique à usage industriel (y compris les industries alimentaires); Dosage de l'oxyde de phosphore(V) total; Méthode gravimétrique au phosphomolybdate de quinoléine
Description:
Applicable to products whether or not they are homogeneous and whether or not they contain polyphosphoric acids. Specifies preliminary hydrolysis of the polyphosphoric acids by boiling in the presence of hydrochloric acid. The precipitation of the phosphoric acid is carried out in the form of quinoline phosphomolybdate in the presence of acetone. Filtration by a filter crucible, washing, drying and weighing of the precipitate.