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| Standard Code | Standard Title | Standard Class | Order |
|---|---|---|---|
| GB/T 7731.1-2021 |
Ferrotungsten—Determination of tungsten content—cinchonine gravimetric method and ammonium nitrate gravimetric method 钨铁 钨含量的测定 辛可宁重量法和硝酸铵重量法 |
China National Standards cinchonine |
 English PDF |
| GB/T 7731.1-1987 |
Methods for chemical analysis of ferrotungsten--The cinchonine gravimetric method for the determination of tungsten content 钨铁化学分析方法 辛可宁重量法测定钨量 |
China National Standards cinchonine |
English PDF |
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