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Methods of test for sodium tripolyphosphate (pentasodium triphosphate) and sodium pyrophosphate (tetrasodium pyrophosphate) for industrial use. Condensed phosphates for industrial use (including foodstuffs) – determination of oxides of nitrogen content – 3,4-xylenol spectrophotometric method
BS 4427-15 – Methods of test for sodium tripolyphosphate (pentasodium triphosphate) and sodium pyrophosphate (tetrasodium pyrophosphate) for industrial use. Condensed phosphates for industrial use (including foodstuffs) – determination of oxides of nitrogen content – 3,4-xylenol spectrophotometric method
Applicable to products having an oxide of nitrogen content, expressed as nitrogen (N), equal to or greater than 2 mg/kg.
