# ISO 3177:1975 — Withdrawn and superseded ISO standards

For ISO 3177:1975, item title is Potassium hydroxide for industrial use — Determination of chlorides content — Photometric method; status code is 9599; successor is ISO/WD 3177; withdrawn / published date is 1975-03-01, recorded from its source on 2026-08-05.

- **Identifier:** ISO 3177:1975 _(verified: appears in the quote below)_
- **Item title:** Potassium hydroxide for industrial use — Determination of chlorides content — Photometric method _(verified: appears in the quote below)_
- **Status code:** 9599 _(verified: appears in the quote below)_
- **Successor:** ISO/WD 3177
- **Withdrawn / published date:** 1975-03-01 _(verified: appears in the quote below)_

## What the source says

> 8365,IS,,ISO 3177:1975,Potassium hydroxide for industrial use — Determination of chlorides content — Photometric method,Hydroxyde de potassium à usage industriel — Dosage des chlorures — Méthode photométrique,1975-03-01,1,['71.060.40'],ISO/TC 47,9599,,[1870],"['en','fr']",3,"<p>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) thi

## Source

- https://isopublicstorageprod.blob.core.windows.net/opendata/_latest/iso_deliverables_metadata/csv/iso_deliverables_metadata.csv

Last verified: 2026-08-05. Review by: 2027-02-01.
Part of [Withdrawn and superseded ISO standards](https://referencesource.org/iso-standard-supersessions/).