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GB/T 14949.7-2024_Chinese: Manganese ores - Determination of sodium and potassium content - Flame atomic absorption spectrometric method (Chinese: 锰矿石 钠和钾含量的测定 火焰原子吸收光谱法) Note/Careful: Text of PDF is in Chinese (not English). Delivery (PDF in Chinese): 2 working-hours typically, ASAP English versions: GB/T 14949.7-2024
