This standard was last reviewed and confirmed in 2019. Therefore this version remains current.
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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A standard is reviewed every 5 years
Stage: 90.93 (Confirmed)
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