Уголь. Определение содержания азота. Полумикрометод Кьельдаля
Название (англ.):
Coal; determination of nitrogen; semi-micro Kjeldahl method
Описание (англ.):
A known mass of the sample is heated with concentrated sulphuric acid in the presence of a mixed catalyst to convert the nitrogen into ammonium sulphate, from which the ammonia, released by steam distillation from alkaline solution, is absorbed in boric acid and determinedby titration with sulphuric acid. The method is only applicable if the nitrogen is distributed fairly uniformly in the coal.
Заменён стандартами:
ISO 333(1996.03)
Дата введения:
01.09.83
Дата отмены:
01.03.96
Код КГС:
А19
Код ОКСТУ:
0308;0320
Код ОКС(МКС):
73.040
Код ОКП:
0308;0320
Нормативные ссылки:
NF M03-018-1967, NEQ
Ключевые слова:
CHEMICAL ANALYSIS CHEMICAL ANALYSIS AND TESTING COAL DETERMINATION OF CONTENT KJELDAHL METHOD KJELDAHLS METHOD NITROGEN SOLID FUELS CHEMICAL ANALYSIS AND TESTIN