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| International Standard Category: Cadmium, cobalt and their alloys |
GB/T 12690.23-1990 Rare-earth metals and their oxides--Determination of acid soluble silicon oxide--Molybdenum blue spectrophotometric method
稀土金属及其氧化物化学分析方法 钼蓝分光光度法测定酸溶硅量 ;
| Category No.: | 77.120.70 | Valid Status: | superseded |
| Issued Organization: | Issued Date: | 1990-01-02 | |
| Implemented Date: | 1992-1-1 | Abolished Date: | 2004-06-01 |
| Superseded Standard.: | GB/T 12690.7-2003 Neodymium and neodymium oxide-Determination of lanthanum oxide, cerium oxide, praseodymium oxide, s |
Superseded Date: | 2004-6-1 |
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