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| Название (рус.): | Натрий фтористый технический. Определение содержания фтора. Модифицированный метод Вилларда-Винтера |
| Название (англ.): | Sodium fluoride for industrial use; Determination of fluorine content; Modified Willard-Winter method |
| Описание (англ.): | The principle consists in separation of the fluorine from a test portion by distillation with sulphuric acid or perchloric acid. Titration with thorium nitrate solution using sodium alizarinsuphonate and methylene blue as indicators. Alternatively the thorium nitrate titration may be carried out using sodium alizarinsuphonate alone as indicator, the end-point beingdetermined spectrophotometrically under carefully defined conditions. The absorbance at a wavelength of 525 nm shall reach the arbitrary value of 0.6. Has also been approved by the IUPAC. |
| Дата регистрации: | 11.02.74 |
| Дата введения: | 01.12.73 |
| Код КГС: | Л19 |
| Код ОКСТУ: | 2154;2109 |
| Код ОКС(МКС): | 71.060.50 |
| Код ОКП: | 2154;2109 |
| Нормативные ссылки: | BS 5072 PART 3-1975, NEQ*NBN T 03-463-1983, EQV*NF T20-151-1984, EQV |
| Ключевые слова: | CHEMICAL ANALYSIS CHEMICAL ANALYSIS AND TESTING CHEMICALS DETERMINATION OF CONTENT FLUORIDES FLUORINE SODIUM SODIUM FLUORIDES VOLUMETRIC ANALYSIS CHEMICAL ANALYSIS AND TESTIN |
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