Reference number
ISO 3946:1982
ISO 3946:1982
© ISO 2024
International Standard
ISO 3946:1982
Starches and derived products — Determination of total phosphorus content — Spectrophotometric method
Edition 1
1982-12
1982-12
ISO 3946:1982
9594
Published
(Edition 1, 1982)
This publication was last reviewed and confirmed in 2019.
Therefore this version remains current.
Abstract
Destruction of the organic substances by digestion with a sulpho-nitric mixture and conversion of phosphates to orthophosphates. Formation of a phosphomolybdate. Measurement of the intensity of the blue colour at a wavelength of 825 nm. The method applies to contents up to 5 % (m/m).
