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| Название (рус.): | Шпат плавиковый для производства плавиковой кислоты и керамики. Определение содержания общего фосфора. Спектрометрический метод с применением восстановленного молибдофосфата |
| Название (англ.): | Acid-grade and ceramic-grade fluorspar; determination of total phosphorus content; reduced-molybdophosphate spectrometric method |
| Описание (англ.): | The method specified is based on dissolution of a test portion by fusion with a mixture of sodium carbonate, boric acid and sodium nitrate and subsequent acidification with nitric acid, formation of the molybdophosphate complex and extraction with a mixture of ethyl acetate and butyl acetate, followed by selective reduction of the complex to molybdenum blue by means of tin(II) chloride added to the organic phase, spectrometric measurement of the absorbance of the coloured complex at the wavelength of maximum absorption (about 710 nm). Applies to products having total phosphorus contents, expressed as PO |
| Заменяет стандарты: | ISO 6676(1990.04) |
| Дата регистрации: | 01.04.93 |
| Дата введения: | 01.04.93 |
| Код КГС: | А59 |
| Код ОКСТУ: | 5726;5709 |
| Код ОКС(МКС): | 73.080 |
| Код ОКП: | 5726;5709 |
| Нормативные ссылки: | ISO 565-1990*ISO 8868-1989 |
| Ключевые слова: | CERAMIC INDUSTRY CHEMICAL ANALYSIS AND TESTING DETERMINATION OF CONTENT FLUORSPAR MINERALS PHOSPHORUS PHOSPHORUS CONTENT SPECTROMETRY CHEMICAL ANALYSIS AND TESTIN MINERALS AND ORES |
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