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| Chinese National Standard Category: Analysis methods for industrial wastewater and pollutants |
| English Title: | Waste gas from manufacturing process; Determination of chemical oxygen demand and nitrogen oxide; Potassium dichromate oxidation and naphthylethylene diamine colorimetric method |
| Chinese Title: | 工业废气 耗氧值和氧化氮的测定 重铬酸钾氧化、萘乙二胺比色法 |
| Standard No.: | GB 4921-1985 |
| Category No.: | Z23 |
| Issued by: | State Environmental Protection Administration |
| Issued on: | 1985-01-18 |
| Implemented on: | 1985-8-1 |
| Status: | valid |
| Superseded by: | |
| Superseded on: | |
| Abolished on: | |
| Superseding: | |
| Word Count: | 1500 words |
| Similar Standards: | DB36/ 1149-2019 GB/T 33686-2017 HJ/T 399-2007 MT/T 366-2007 MT/T 361-2007 MT/T 367-2007 MT/T 1045-2007 MT/T 1047-2007 MT/T 1046-2007 MT/T 370-2007 DL/T 997-2006 MT/T 371-2005 MT/T 373-2005 MT/T 368-2005 MT/T 360-2005 MT/T 359-2005 HJ/T 132-2003 HJ/T 70-2001 MT/T 251-2000 MT/T 891-2000 |
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