# ISO 6978:1992 — Withdrawn and superseded ISO standards

For ISO 6978:1992, item title is Natural gas — Determination of mercury; status code is 9599; successor is ISO 6978-1:2003 | ISO 6978-2:2003; withdrawn / published date is 1992-08-20, recorded from its source on 2026-08-05.

- **Identifier:** ISO 6978:1992 _(verified: appears in the quote below)_
- **Item title:** Natural gas — Determination of mercury _(verified: appears in the quote below)_
- **Status code:** 9599 _(verified: appears in the quote below)_
- **Successor:** ISO 6978-1:2003 | ISO 6978-2:2003
- **Withdrawn / published date:** 1992-08-20 _(verified: appears in the quote below)_

## What the source says

> 13533,IS,,ISO 6978:1992,Natural gas — Determination of mercury,Gaz naturel — Détermination de la teneur en mercure,1992-08-20,1,['75.060'],ISO/TC 193/SC 1,9599,,"[38600,38601]","['en','fr']",11,"<p>Two methods are specified: method A for higher mercury content (&gt; 0,5 µg/m^3) based on sampling at atmospheric pressure, absorption in potassium permangante solution, reduction of mercury ions, analysis by flameless atomic absorption spectrometry; method B for lower mercury content (10^- 3 µg/m^3 to 1 µg/m^3) based on sampling at atmospheric or higher pressure, adsorption on silver/gold, desorption, analysis by flameless atomic absorption spectrometry.</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Part of [Withdrawn and superseded ISO standards](https://referencesource.org/iso-standard-supersessions/).