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ISO 3946:1982
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ISO 3946:1982 Starches and derived products -- Determination of total phosphorus content -- Spectrophotometric method
standard by International Organization for Standardization, 12/01/1982
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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).