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EC number: 200-756-3
CAS number: 71-55-6
Monitoring data in the aquatic
environment for trichloroethane is extensive. Data from either
government controlled or government-sponsored agencies have been
monitoring levels in the environment for over 20 years. The results
included in the EUROCHLOR 1999 report and in the UK Department of the
Environment 1996 report reflect the picture before the full effect of
the Montreal protocol have become evident and the authors indicate that
the levels recorded are probably higher than would be expected at the
present time. The monitoring data is adequate to predict on an
analytical basis the PEC for the marine/brackish water/freshwater
environment without the need for modelling. On the basis of the
information available the PEC immediately before and just after the
introduction of the Montreal protocol was 21ug/L and, following the
effects of restricted use imposed in the Montreal protocol, the EU
required PEC of 10ug/L has probably been achieved in most situations
around the North Sea coast and in North European freshwater systems.
Wakeham et al 1983 used large
mesocosms to predict the rate of loss from the estuarine environment.
This work confirmed that the expected half life in the marine
environment is very low due to volatilisation to the atmosphere. The
most interesting finding in this study is that volatilisation is not
temperature driven as would be expected but is primarily dependent on
the level of wave activity with the highest losses recorded during the winter
period in stormy weather.
Zoeteman et al 1981 summarises
the results of a survey of potential contaminants that could find their
way into potable water conducted in 1976 -1978 at all 232 groundwater
pumping stations in the Netherlands. The results of this survey show
that the materials of most concerned were trichloroethylene (67%),
trichloromethane (60%) and tetrachloromethane (43%). The authors
summarise potential routes of entry into aquifers and conclude that the
most probable route is from unregulated industrial waste disposal sites.
Deposition from the atmosphere in rain is not thought to account for
levels >0.01 - 0.1ug/L. At the time this survey was conducted the use of
halogenated hydrocarbons was not regulated therefore these results
should be treated as a worst-case scenario as the effects of the
Montreal Protocol have severely restricted the use of these materials in
industry. In addition regulatory control is now sufficient to prevent
unregulated disposal and appreciable efforts are now made to recover
materials such as trichloroethane to prevent environmental contamination.
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.Reproduction or further distribution of this information may be subject to copyright protection. Use of the information without obtaining the permission from the owner(s) of the respective information might violate the rights of the owner.
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