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| International Standard Category: Cadmium, cobalt and their alloys |
GB/T 12690.13-1990 Neodymium and samarium-Determination of carbon content-High frequency-Infrared absorption method
稀土金属及其氧化物化学分析方法 高频-红外吸收法测定金属钕、金属钐中碳量 ;
| Category No.: | 77.120.70 | Valid Status: | superseded |
| Issued Organization: | Issued Date: | 1990-12-30 | |
| Implemented Date: | 1992-1-1 | Abolished Date: | 2003-06-01 |
| Superseded Standard.: | GB/T 12690.3-2002 Chemical analysis methods for non-RE impurity of rare earth metals and their oxides-Determination of water content of rare earth oxides-Gravimetric method GB/T 12690.1-2002 Chemical analysis methods for non-RE impurity of rare earth metals and their oxides-Determination of carbon and sulfur contents-High frequency-infrared absorptoin method |
Superseded Date: | 2003-6-1 |
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