KS E ISO 621-2012(2017) Manganese ores-Determination of metallic iron content (metallic iron content not exceeding 2 %)-Sulphosalicylic acid photometric method
2012KS E ISO 621:2012 Manganese ores-Determination of metallic iron content (metallic iron content not exceeding 2 %)-Sulphosalicylic acid photometric method