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20-2024_Chinese: Chemical analysis methods for non-rare earth impurities of rare earth metals and their oxides - Part 20: Determination of minor amounts of fluorine and chlorine in rare earth oxides - Ion chromatography method (Chinese: 稀土金属及其氧化物中非稀土杂质化学分析方法 第20部分：稀土氧化物中微量氟、氯的测定 离子色谱法)
English versions: GB/T 14478-2025
English versions: GB 15093-2025
GB 11984-2024_Chinese: Technical specification for chlorine safety of chemical industrial enterprises (Chinese: 化工企业氯气安全技术规范)
GB 31604.62-2025 English PDF GB 45673-2025 20-2024_Chinese: Chemical analysis methods forGB 31604. 62 2025_Chinese: National food safety standard Food contact materials and products Determination of migration and release of N nitrosamines (Chinese: N ) Note Careful: Text of PDF is in Chinese (not English). Delivery (PDF in Chinese): 2 working hours typically, ASAP English versions: GB 31604. 62 2025
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