Home / Standards / GB/T 223.91-2021 GB/T 223.91-2021 Active Iron, steel and alloy—Determination of copper—2,2’-Biquinoline spectrophotometric method 钢铁及合金 铜含量的测定 2，2'-联喹啉分光光度法 Standard Type GBT ICS 77.080.01 CCS H11 Status 现行 Issue Date 2021-08-20 Implementation 2022-03-01 Responsible Dept 中国钢铁工业协会 Drafting Unit N/A