NORMSERVIS s.r.o.

ISO 3360:1976

Phosphoric acid and sodium phosphates for industrial use (including foodstuffs) — Determination of fluorine content — Alizarin complexone and lanthanum nitrate photometric method

NORMA vydaná dňa 1.8.1976

Anglicky -
Elektronické PDF (54.10 EUR)
Anglicky -
Tlačené (54.10 EUR)


Francúzsky -
Elektronické PDF (54.10 EUR)
Francúzsky -
Tlačené (54.10 EUR)

Informácie o norme:

Označenie normy: ISO 3360:1976
Dátum vydania normy: 1.8.1976
Počet strán: 5
Približná hmotnosť: 15 g (0.03 libier)
Krajina: Medzinárodná technická norma
Kategória: Technické normy ISO

Anotácia textu normy ISO 3360:1976 :

Description / Abstract: Applicable to products the F content of which is equal to or more than 0.5 mg/kg. Specifies the separation of the element from a test portion by steam distillation in a phosphoric acid medium. Formation of a blue-coloured complex with a combined reagent alizarin complexone/lanthanum nitrate in a buffered medium at the pH of 4.6. Addition of acetone to increase the stability of the complex and the sensitivity. Photometric measurement of the complex at a wavelength of about 600 nm.