Кислота фосфорная техническая (в том числе для пищевой промышленности). Определение содержания оксидов азота. Спектрофотометрический метод с применением 3,4-ксиленола
Название (англ.):
Phosphoric acid for industrial use (including foodstuffs); Determination of oxides of nitrogen content; 3,4- Xylenol spectrophotometric method
Описание (англ.):
Applicable to products having a content, expressed as N, equal to or more than 0.2 mg/kg. Consists in oxidation of nitrous nitrogen to nitric nitrogen by potassium permanganate and reaction of nitrogen(V) with 3,4-xylenol under specified conditions to form a nitrate derivative. Subsequent destillation of the nitrate derivative and absorption in sodium hydroxide solution. Spectrophotometric measurement of the yellow nitrophenol at a wavelength of about 435 nm.
Дата регистрации:
10.01.77
Дата введения:
01.11.76
Дата отмены:
30.05.02
Код КГС:
Л19
Код ОКСТУ:
2121;2109
Код ОКС(МКС):
67.220.20; 71.060.30
Код ОКП:
2121;2109
Нормативные ссылки:
BS 4258 PART 10-1978, EQV*NBN T 03-270-1980, EQV*NF T20-482-1979, EQV*NP-1544-1978, EQV
Ключевые слова:
CHEMICAL ANALYSIS CHEMICAL ANALYSIS AND TESTING CHEMICAL COMPOUNDS CONNECTIONS DETERMINATION OF CONTENT FOOD ADDITIVES FOOD INDUSTRY INDUSTRIES NITROGEN OXIDES PHOSPHORIC ACID PHOSPHORIC ACIDS SPECTROPHOTOMETRIC ANALYSIS SPECTROPHOTOMETRY XYLENOL CHEMICAL ANALYSIS AND TESTIN