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Sodium and potassium silicates for industrial use — Determination of iron content — 1,10- Phenanthroline phot…

Manganese ores — Determination of sulphur content — Barium sulphate gravimetric methods and sulphur dioxide t…

Overview ISO 320:1981 specifies laboratory methods for the determination of sulphur in manganese ores. It defines three procedures: Methods I and II (barium sulphate gravimetric methods) for manganes…