Гексафторсиликат натрия технический. Определение содержания соединений серы. Йодометрический метод после восстановления
Название (англ.):
Sodium hexafluorosilicate for industrial use; Determination of sulphur compounds content; Iodometric method after reduction
Описание (англ.):
Applicable to products having contents, expressed as sulphate2- , between 0.03 % (m/m) and 0.5 % (m/m). Reduction of the compounds to hydrogen sulphide by heating with a mixture of hydriodic andhypophosphorus acids in the presence of hydrochloric acid. Entrainment of the hydrogen sulphide in a flow of nitrogen and absorption in an excess of ammoniacal cadmium acetate solution. Liberation of the absorbed hydrogen sulphide in the presence of an excess of standard volumetric iodate/iodide solution. Back-titration of the excess iodine with standard volumetric sodium thiosulphate solution using starch as the indicator. An apparatus for reduction, entrainment and absorption is shown in a figure. Has also been approved by the IUPAC.
Дата регистрации:
01.01.81
Дата введения:
01.10.80
Код КГС:
Л19
Код ОКСТУ:
2145;2109;2154
Код ОКС(МКС):
71.060.50
Код ОКП:
2145;2109;2154
Нормативные ссылки:
BS 5705 PART 7-1981, EQV*NBN T 03-528-1983, EQV*NF T20-531-1984, EQV
Ключевые слова:
CHEMICAL ANALYSIS CHEMICAL ANALYSIS AND TESTING CHEMICAL COMPOUNDS CONNECTIONS DETERMINATION OF CONTENT FLUOROSILICATES IODOMETRY REDUCTION (CHEMISTRY) REDUCTION METHODS SODIUM SODIUM FLUOROSILICATES SULPHATES CHEMICAL ANALYSIS AND TESTIN FLUORINE SILICATES