# ISO 986:1976 — Withdrawn and superseded ISO standards

For ISO 986:1976, item title is Sodium hydroxide for industrial use — Determination of calcium content  — EDTA (disodium salt) complexometric method; status code is 9599; successor is ISO/CD 986; withdrawn / published date is 1976-05-01, recorded from its source on 2026-08-05.

- **Identifier:** ISO 986:1976 _(verified: appears in the quote below)_
- **Item title:** Sodium hydroxide for industrial use — Determination of calcium content  — EDTA (disodium salt) complexometric method _(verified: appears in the quote below)_
- **Status code:** 9599 _(verified: appears in the quote below)_
- **Successor:** ISO/CD 986
- **Withdrawn / published date:** 1976-05-01 _(verified: appears in the quote below)_

## What the source says

> 5427,IS,,ISO 986:1976,Sodium hydroxide for industrial use — Determination of calcium content — EDTA (disodium salt) complexometric method,Hydroxyde de sodium à usage industriel — Dosage du calcium — Méthode complexométrique à l'EDTA (sel disodique),1976-05-01,1,['71.060.40'],ISO/TC 47,9599,,[5428],"['en','fr']",3,"<p>The method is applicable to products having a calcium content equal to or greater than 0.002 % (m/m). The principle consists in titration of the calcium with a standard volumetric solution of the disodium salt of (ethylenedinitrilo)tetraacetic acid (EDTA disodium salt) in the presence of 2,2'-(ethylenedinitrilo)diphenol Äglyoxal-bis-(2-hydroxyanil)Ü as indicator, after eliminat

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Part of [Withdrawn and superseded ISO standards](https://referencesource.org/iso-standard-supersessions/).