• There are no items in your cart
We noticed you’re not on the correct regional site. Switch to our AMERICAS site for the best experience.
Dismiss alert

EN 12121:2012


A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.

Chemicals used for treatment of water intended for human consumption - Sodium disulfite
Superseded date


Published date


1 Scope
2 Normative references
3 Description
4 Purity criteria
5 Test methods
6 Labelling - Transportation - Storage
Annex A (informative) - General information on
        sodium disulfite
Annex B (normative) - General rules relating to

This European Standard is applicable to sodium disulfite used for treatment of water intended for human consumption. It describes the characteristics of sodium disulfite and specifies the requirements and the corresponding test methods for sodium disulfite. It gives information on its use in water treatment. It also determines the rules relating to safe handling and use (see Annex B).

CEN/TC 164
Supersedes PREN 12121. (12/2012)
Comite Europeen de Normalisation

Standards Relationship
PN EN 12121 : 2013 Identical
BS EN 12121:2012 Identical
NBN EN 12121 : 2013 Identical
DIN EN 12121:2013-02 Identical
SS-EN 12121:2012 Identical
SN EN 12121 : 2012 Identical
I.S. EN 12121:2012 Identical
NEN EN 12121 : 2012 Identical
NS EN 12121 : 2012 Identical
UNE-EN 12121:2013 Identical
NF EN 12121 : 2013 Identical
UNI EN 12121 : 2013 Identical
DS EN 12121 : 2013 Identical
ONORM EN 12121 : 2013 Identical

ISO 3165:1976 Sampling of chemical products for industrial use — Safety in sampling
ISO 6353-1:1982 Reagents for chemical analysis — Part 1: General test methods
ISO 3629:2000 Photography Processing chemicals Specifications for potassium metabisulfite
ISO 9297:1989 Water quality Determination of chloride Silver nitrate titration with chromate indicator (Mohr's method)
ISO 3696:1987 Water for analytical laboratory use — Specification and test methods
ISO 22743:2006 Water quality Determination of sulfates Method by continuous flow analysis (CFA)
EN ISO 3696:1995 Water for analytical laboratory use - Specification and test methods (ISO 3696:1987)
ISO 6206:1979 Chemical products for industrial use — Sampling — Vocabulary
ISO 5993:1979 Sodium hydroxide for industrial use — Determination of mercury content — Flameless atomic absorption spectrometric method
ISO 8213:1986 Chemical products for industrial use — Sampling techniques — Solid chemical products in the form of particles varying from powders to coarse lumps

View more information
Sorry this product is not available in your region.

Access your standards online with a subscription


  • Simple online access to standards, technical information and regulations.

  • Critical updates of standards and customisable alerts and notifications.

  • Multi-user online standards collection: secure, flexible and cost effective.