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| Chinese National Standard Category: Steel and iron alloy analysis method |
| English Title: | Methods for chemical analysis of ferrotungsten-The bismuth iodide photometric method for the determination of bismuth content |
| Chinese Title: | 钨铁化学分析方法 碘化铋光度法测定铋量 |
| Standard No.: | GB 7731.9-1987 |
| Category No.: | H11 |
| Issued by: | Ministry of Metallurgical Industry |
| Issued on: | 1987-03-31 |
| Implemented on: | 1988-3-1 |
| Status: | superseded |
| Superseded by: | GB/T 7731.9-2008 Ferrotungsten - Determination of bismuth content - The bismuth iodide photometric method and inductively coupled plasma - atomic emission spectrometry |
| Superseded on: | 2009-4-1 |
| Abolished on: | 2009-04-01 |
| Superseding: | YB 583-1965 |
| Word Count: | 1000 words |
| Similar Standards: |
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