The method consists in extraction by shaking with dimethylformamide, then after centrifuging, addition of ferric ammonium citrate and ammonia to an aliqiot part of the supernatant liquid and spectrometric determination, at 525 nm, of the absorbance of the solution thus obtained, and determing of the tannic content using a calibration curve prepared using tannic acid.
Дата регистрации:
01.01.89
Дата введения:
15.12.88
Код КГС:
С19
Код ОКСТУ:
9710;9709
Код ОКС(МКС):
67.060
Код ОКП:
9710;9709
Нормативные ссылки:
ISO 712-1985*ISO 950-1979
Ключевые слова:
AGRICULTURAL PRODUCTS CEREALS CHEMICAL ANALYSIS CHEMICAL ANALYSIS AND TESTING DETERMINATION OF CONTENT GRAINS (FOOD) SORGHUM TANNIC ACID TANNINS CHEMICAL ANALYSIS AND TESTIN GRAIN CROPS