Chemical hazards in drinking-water - sodium dichloroisocyanurate
Rolling revision of the WHO Guidelines for Drinking-water Quality
Sodium dichloroisocyanurate is included in the plan of work of the rolling revision of the WHO Guidelines for Drinking-water Quality.
Background
Sodium dichloroisocyanurate is used as a disinfectant in water. It dissociates in water to form cyanuric acid. The GDWQ FTF meeting (Geneva, 2003) recommended that sodium dichloroisocyanurate be referred to JECFA and added to the rolling revision of the GDWQ. A guideline value for use in emergency situations would reassure those who need to use the disinfectant.
Expected end-product(s)
- A background document and summary statement on sodium dichloroisocyanurate for publication in second addendum;
- revised text in sections 4.5 and 6.2 of GDWQ for inclusion in second addendum or Fourth Edition;
- amendments to the supporting document Water Treatment and Pathogen Control: Process Efficiency in Achieving Safe Drinking-water (second edition, due in 2008)
Progress to date
JECFA’s review was completed in June 2003, and a TDI has been derived from which a guideline value can be calculated. The GDWQ WG meeting (Geneva, 2005) agreed to a revised plan of work. The GDWQ WG meeting (Geneva, 2006) agreed that the background document could be sent out for review after internal peer review comments had been taken into consideration.
The draft document is now available for review. Comments are welcome following the format on the comment sheet, below.
Comments on the draft background document above should be sent before 17 April 2007 to gdwqNaDCC@who.int.
Other publications of interest
In preparation:
- Chemical safety of drinking-water: Assessing priorities for risk management
- Managing surface waters for health