This standard specifies a method for the determination of manganese in direct zinc oxidation using flame atomic absorption spectroscopy (AAS), suitable for the determination of manganese content in the range of 0.0001% to 0.0010%. Trace amounts of manganese are separated and enriched from a large amount of zinc matrix by dissolving the sample with nitric acid and using ferric hydroxide as a co-precipitant. The standard provides specifications for the accurate determination of trace amounts of manganese with detailed descriptions of reagents, instruments and operating procedures.