Reference number
ISO 3357:1975
ISO 3357:1975
© ISO 2024
International Standard
ISO 3357:1975
Sodium tripolyphosphate and sodium pyrophosphate for industrial use — Determination of total phosphorus(V) oxide content — Quinoline phosphomolybdate gravimetric method
Edition 1
1975-09
1975-09
ISO 3357:1975
8643
Published
(Edition 1, 1975)
This publication was last reviewed and confirmed in 2023.
Therefore this version remains current.
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.