ISO 3177:1975

Potassium hydroxide for industrial use — Determination of chlorides content — Photometric method

Applicable to products having contents, expressed as chlorine, between 2 mg/kg and 50 mg/kg. For contents exceeding 50mg/kg the method specified in ISO 992 shall be used. The principle consists in quantitative displacement of the thiocyanate (SCN- ) ions of the mercury(II) thiocyanate by the cloride (Cl- ) ions contained in the test portion. Reaction of the thiocyanate ions with iron(III) nitrate to form iron(III) thiocyanate (red). Photometric measurement of the colour at a wavelength of about 450 nm.

OEN:

ISO

Langue:

English

Code(s) de l'ICS:

71.060.40

Statut:

Annulée

Date de Publication:

1975-02-28

Numéro Standard:

ISO 3177:1975