ISO 3946:1982

Current Revision
Starches and derived products -- Determination of total phosphorus content -- Spectrophotometric method

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ISO 3946:1982

Starches and derived products -- Determination of total phosphorus content -- Spectrophotometric method

PUBLISH DATE 1982
ISO 3946:1982

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).

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