ISO 3177:1975 PDF
Potassium hydroxide for industrial use — Determination of chlorides content — Photometric method
Open preview (PDF)Potassium hydroxide for industrial use — Determination of chlorides content — Photometric methodTitle (English):
ISO 3177:1975
Potassium hydroxide for industrial use — Determination of chlorides content — Photometric method
- Document status:
- Withdrawn
- Format:
- Electronic (PDF)
- Number of pages:
- 3
- Publication date:
- March 1, 1975
- Edition:
- ISO IS 3177 edition 1 version 1
- ICS:
- 71.060.40
Description (English):
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.
Technical details
- Technical committee
- ISO/TC 47 - Chemistry
- SKU
- ISO 3177:1975
