Home / Standards / GB/T 21057-2007 GB/T 21057-2007 Active Inorganic chemical for industrial use - General method for determination of fluorine content-Ion selective electrode method 无机化工产品中氟含量测定的通用方法 离子选择性电极法 Standard Type GBT ICS 71.060.01 CCS G10 Status 现行 Issue Date 2007-08-13 Implementation 2008-02-01 Responsible Dept 中国石油和化学工业联合会 Drafting Unit N/A