HG/T 5803\uff5e5806-2021
KS M 1914-2002(2007)
Phthalic anhydride for industrial use-Methods of test-Determination of impurities oxidizable in the cold by potassium permanganate-Iodometric method
ISO 1389-9:1977
Phthalic anhydride for industrial use — Methods of test — Part 9: Determination of impurities oxidizable in the cold by potassium permanganate — Iodometric method
32018R1039R(02)