This standard has been reviewed* and then confirmed in 2013.
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).
Edition: 1 (Monolingual) ICS: 67.180.20 Status: Published Stage: 90.93 (2013-04-04) TC/SC: ISO/TC 93 Number of Pages: 3
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