Acid-grade and ceramic-grade fluorspar; determination of total phosphorus content; reduced-molybdophosphate spectrometric method
Описание (англ.):
Removal of silica by treating the test portion with hydrofluoric and sulfuric acid. Dissolution of the residue and formation of the molybdophosphate complex. Potentiometric measurement of this complex after extraction from the reaction solution with a mixture of butanol and chloroform.
Заменён стандартами:
ISO 6676(1993.04)
Заменяет стандарты:
ISO 6676(1981.11)
Дата введения:
01.04.90
Дата отмены:
01.04.93
Нормативные ссылки:
ISO 4282-1977*ISO 565-1983
Ключевые слова:
CERAMICS CHEMICAL ANALYSIS CHEMICAL ANALYSIS AND TESTING DETERMINATION OF CONTENT FLUORSPAR MINERALS MINERALS AND ORES PHOSPHORUS SPECTROPHOTOMETRIC ANALYSIS SPECTROPHOTOMETRY CHEMICAL ANALYSIS AND TESTIN