ISO 553:1981

Manganese ores — Determination of vanadium content — Titrimetric method and phosphotungstovanadate photometric method

Method I is applicable to manganese ores having vanadium contents greater than 0.05 % (m/m), method II is applicable to manganese ores having vanadium contents less than 0.05 % (m/m). This second edition cancels and replaces the first edition (i.e. ISO 553-1975). Should be read in conjunction with ISO 4297.