# ISO 3238:1975 — Withdrawn and superseded ISO standards

For ISO 3238:1975, item title is Sodium sulphate for industrial use — Determination of calcium content — EDTA complexometric method; status code is 9599; successor is ISO/CD 3238; withdrawn / published date is 1975-07-01, recorded from its source on 2026-08-05.

- **Identifier:** ISO 3238:1975 _(verified: appears in the quote below)_
- **Item title:** Sodium sulphate for industrial use — Determination of calcium content — EDTA complexometric method _(verified: appears in the quote below)_
- **Status code:** 9599 _(verified: appears in the quote below)_
- **Successor:** ISO/CD 3238
- **Withdrawn / published date:** 1975-07-01 _(verified: appears in the quote below)_

## What the source says

> 8449,IS,,ISO 3238:1975,Sodium sulphate for industrial use — Determination of calcium content — EDTA complexometric method,Sulfate de sodium à usage industriel — Dosage du calcium — Méthode complexométrique à l'EDTA,1975-07-01,1,['71.060.50'],ISO/TC 47,9599,,[8450],"['en','fr']",3,<p>Applicable to products the Ca content of which exceeds 0.002 % (m/m). Extraction of a test portion with dilute acid and separation of the insoluble residue. Titration of the calcium with standard volumetric disodium ethylenediamine-NNN'N'-tetra-acetate dihydrate (EDTA) solution in the presence of glyoxal-bis(hydoxy-2-anil) as indicator.</p>

## 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Part of [Withdrawn and superseded ISO standards](https://referencesource.org/iso-standard-supersessions/).