Sodium tripolyphosphate and sodium pyrophosphate for industrial use — Determination of total phosphorus(V) oxide content — Quinoline phosphomolybdate gravimetric method
NORMA vydána dne 1.9.1975
Designation standards: ISO 3357:1975
Publication date standards: 1.9.1975
The number of pages: 3
Approximate weight : 9 g (0.02 lbs)
Country: International technical standard
Kategorie: Technické normy ISO
Description / Abstract: Based on hydrolysis of a test portion by prolonged boiling in the presence of hydrochloric acid. Precipitation of the phosphate ions in the form of quinoline phosphomolybdate in the presence of acetone. Filtration by means of a filter crucible, washing, drying and weighing of the precipitate.