Home / Standards / GB/T 7731.2-2007 GB/T 7731.2-2007 Active Ferrotungsten - Determination of manganese content - The periodate spectrophotometric method and the flame atomic absorption spectrometric method 钨铁 锰含量的测定 高碘酸盐分光光度法和火焰原子吸收光谱法 Standard Type GBT ICS 77.100 CCS H11 Status 现行 Issue Date 2007-09-11 Implementation 2008-02-01 Responsible Dept 中国钢铁工业协会 Drafting Unit N/A