Home / Standards / GB/T 20899.9-2025 GB/T 20899.9-2025 Active Methods for chemical analysis of gold ores—Part 9: Determination of carbon content 金矿石化学分析方法 第9部分:碳量的测定 Standard Type GBT ICS 73.060.99 CCS D46 Status 现行 Issue Date 2025-06-30 Implementation 2026-01-01 Responsible Dept 国家标准委 Drafting Unit N/A