KS M 1914-2009 Phthalic anhydride for industrial use-Methods of test-Determination of impurities oxidizable in the cold by potassium permanganate-Iodometric method
2009KS M 1914-2009 Phthalic anhydride for industrial use-Methods of test-Determination of impurities oxidizable in the cold by potassium permanganate-Iodometric method