What is BS EN 12120 - Sodium hydrogen sulfite used for the treatment of water about?
BS EN 12120 is the European standard that gives guidance on sodium hydrogen sulfite for use in the treatment of water intended for human consumption.
It describes the characteristics of sodium hydrogen sulfite and specifies the requirements and the corresponding test methods for sodium hydrogen sulfite.
Who is BS EN 12120 - Sodium hydrogen sulfite used for the treatment of water for?
BS EN 12120 on sodium hydrogen sulfite used for the treatment of water is useful for:
- Water treatment plant
- Chemical laboratories
- Health and safety bodies  
- Regulatory authorities 
- Chemical industries 
- Water suppliers
Why should you use BS EN 12120 - Sodium hydrogen sulfite used for the treatment of water?
Sodium hydrogen sulfite is primarily used for water treatment to remove excess chlorine in drinking water.
Sodium hydrogen sulfite’s more use would be dangerous for health that can cause side effects such as abdominal pain, diarrhea, hives, low blood pressure, and even life-threatening anaphylaxis. Therefore, BS EN 12120 gives information on sodium hydrogen sulfite to use in water treatment.
BS EN 12120 provides you with the minimum purity requirements for sodium hydrogen sulfite used for the treatment of water intended for human consumption. Limits are given for impurities commonly present in the product. Depending on the raw material and the manufacturing process other impurities may be present and, if so, this shall be notified to the user and when necessary to relevant authorities.
BS EN 12120 provides you guidance on test methods that include sampling and analysis. It guides the labelling, transportation, and storage of the product so that the purity is not affected. It ultimately helps to avoid potential adverse effects on the quality of water intended for human consumption.
What is changed since the last update?
BS EN 12120:2012 supersedes BS EN 12120:2005 which is withdrawn.
The significant technical differences between BS EN 12120:2012 and EN 12120:2005 are as follows:
- Modification of 6.2 on labelling, deletion of the reference to EU Directive 80/778/EEC of 15 July 1980 in order to take account of the latest Directive in force
