KS E ISO 7990-2002(2017) Manganese ores and concentrates-Determination of total iron content-Titrimetric method after reduction and sulfosalicylic acid spectrophotometric method
2002KS E ISO 7990:2002 Manganese ores and concentrates-Determination of total iron content-Titrimetric method after reduction and sulfosalicylic acid spectrophotometric method