Home / Standards / GB/T 6730.85-2023 GB/T 6730.85-2023 Active Iron ores—Preparation and certification of certified reference materials for use in chemical analysis 铁矿石 化学分析用有证标准样品的制备和定值 Standard Type GBT ICS 73.060.10 CCS D31 Status 现行 Issue Date 2023-08-06 Implementation 2024-03-01 Responsible Dept 中国钢铁工业协会 Drafting Unit N/A