ISO 848:1981
Withdrawn
Phosphoric acid for industrial use — Determination of calcium content — Titrimetric method
Hardcopy , PDF
English, French
11-01-1981
02-26-2019
The general method is applicable to phosphoric acid not containing polyphosphoric acids and to products having a calcium content equal to or greater than 0.020 % (m/m). In special cases a preliminary hydrolysis of polyphosphoric acids is carried out by prolonged boiling in the presence of hydrochloric acid. Precipitation of calcium as calcium oxalate at pH 4 0.3, filtration of the precipitate, dissolution in hydrochloric acid and re-precipitation under the same operating conditions in order to purify the precipitate. Oxidimetric titration in sulphuric acid solution by means of potassium permanganate. - Cancels and replaces ISO Recommendation R 848-1968.
| Committee |
ISO/TC 47
|
| DocumentType |
Standard
|
| Pages |
5
|
| PublisherName |
International Organization for Standardization
|
| Status |
Withdrawn
|
| Standards | Relationship |
| NBN T 03 261 : 1982 | Identical |
| NFT 20 472 : 1973 | Similar to |
| BS 4258-12:1982 | Methods of test for phosphoric acid (orthophosphoric acid) for industrial use Guide to sampling techniques |
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