HG/T 2770-2020
HG/T 5939-2021
HG/T 2770-2008
Ammonium polyphosphate for industrial use
QB/T 1035.2-1991
BS 4427-12:1979
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 arsenic content. Silver diethyldithiocarbamate photometric method