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| Standard Code | Standard Title | Standard Class | Order |
|---|---|---|---|
| GB/T 23938-2021 |
High purity carbon dioxide 高纯二氧化碳 |
China National Standards High purity carbon |
 English PDF |
| GB/T 12690.1-2015 |
Chemical analysis methods for non-rare earth impurity of rare earth metals and their oxides—Part 1: Determination of carbon and sulfur contents—High frequency-infrared absorption method 稀土金属及其氧化物中非稀土杂质化学分析方法 第1部分：碳、硫量的测定 高频-红外吸收法 |
China National Standards High purity carbon |
English PDF |
| GB/T 23938-2009 |
High purity carbon dioxide 高纯二氧化碳 |
China National Standards High purity carbon |
English PDF |
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