ISO 4281:1977
Current
The latest, up-to-date edition.
Sodium hexafluorosilicate for industrial use — Determination of free acidity and total hexafluorosilicate content — Titrimetric method
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English, French
01-03-1977
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With respect to the free acidity, applicable to products having contents, expressed as H2 SiF6 , equal to or more than 0,1 % (m/m). First, determination of the free acid contents by titration of an ice-cooled test portion with a standard volumetric sodium hydroxide solution in the presence of potassium nitrate and using bromothymol blue as indicator, then, followed by titration at near boiling temperature with standard volumetric sodium hydroxide solution to the appearance of a permanent blue colour.
| Committee |
ISO/TC 47
|
| DocumentType |
Standard
|
| Pages |
2
|
| PublisherName |
International Organization for Standardization
|
| Status |
Current
|
| Standards | Relationship |
| NBN T 03 526 : 1983 | Identical |
| BS 5705-1:1979 | Identical |
| NFT 20 531 : 84 FD | Identical |
| EN 12174:2013 | Chemicals used for treatment of water intended for human consumption - Sodium hexafluorosilicate |
| PREN 12174 : DRAFT 2012 | CHEMICALS USED FOR TREATMENT OF WATER INTENDED FOR HUMAN CONSUMPTION - SODIUM HEXAFLUOROSILICATE |
| I.S. EN 12174:2013 | CHEMICALS USED FOR TREATMENT OF WATER INTENDED FOR HUMAN CONSUMPTION - SODIUM HEXAFLUOROSILICATE |
| ONORM EN 12174 : 2013 | CHEMICALS USED FOR TREATMENT OF WATER INTENDED FOR HUMAN CONSUMPTION - SODIUM HEXAFLUOROSILICATE |
| DIN EN 12174:2013-08 | Chemicals used for treatment of water intended for human consumption - Sodium hexafluorosilicate |
| UNI EN 12174 : 2013 | CHEMICALS USED FOR TREATMENT OF WATER INTENDED FOR HUMAN CONSUMPTION - SODIUM HEXAFLUOROSILICATE |
| BS EN 12174:2013 | Chemicals used for treatment of water intended for human consumption. Sodium hexafluorosilicate |
| UNE-EN 12174:2013 | Chemicals used for treatment of water intended for human consumption - Sodium hexafluorosilicate |
| 12/30268242 DC : 0 | BS EN 12174 - CHEMICALS USED FOR TREATMENT OF WATER INTENDED FOR HUMAN CONSUMPTION - SODIUM HEXAFLUOROSILICATE |
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