Home / Standards / GB/T 46693-2025 GB/T 46693-2025 Active Method for the determination of isotopic composition and concentration of dissolved noble gas in water 水中溶解性稀有气体同位素组成及含量测定方法 Standard Type GBT ICS 27.120.99 CCS F40 Status 现行 Issue Date 2025-10-31 Implementation 2026-05-01 Responsible Dept 国家标准委 Drafting Unit N/A