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EC number: 203-458-1
CAS number: 107-06-2
Not biodegradable in soil and water under
non-adapted conditions. Biodegradable after adaptation and methane
Different investigations have been
undertaken to study the biodegradability of 1,2-dichloroethane. However,
there are no standardized screening studies on ready or inherently
biodegradation available. In the various non-guideline studies which
were mostly conducted according to generally acceptable principles it
could be shown that the material is not biodegradable when non-adapted,
non-acclimated conditions were used. In contrast biodegradation occurred
when adapted or induced micro-organisms were used. Under abiotic
conditions biodegradation of 1,2 -dichloroethane is too slow to be an
important environmental fate process.
Based on both the water solubility and high
volatility, adsorption to soil and sediments is not expected, which is
supported by an experimentally determined KOC-value of 33 for silt loam.
The substance rapidly percolates through sandy soil.
Taking into consideration the measured
octanol/water partition coefficient of 1.45, no potential for
bioaccumulation/bioconcentration can be identified. This is supported by
calculated and experimentally determined bioconcentration factors of 2.
1,2-Dichloroethane is predominantly
distributed in air (95 %) and only in minor portion into water (<4.8 %)
while all other compartments such as soil, sediment, suspended matter
and biota make no substantial contributions. The relative high degree of
distribution into air is based on the high vapour pressure and the high
volatility of the substance from water as indicated from the calculated
and experimentally determined Henry’s Law constants of 95.7 Pa *m3/mol
and 149 Pa * m3/mol, respectively.
Based on the high vapour pressure and
volatility of the substance, 1,2-dichloroethane entering aquatic systems
would be transferred to the atmosphere through volatilisation. Results
of laboratory experiments yielded half-lives in water ranging from 0.5 –
4 hours. A half-life of 1.4 hours for the removal from running river
water was found in outdoor experiments conducted under controlled
conditions. These results indicate that 1,2 -dichloroethane is expected
to be rapidly removed from aqueous media by volatilisation. Nevertheless
the low affinity for soil may pose a risk of groundwater contamination.
Due to its chemical structure, the substance
will not undergo hydrolysis in water. Photodegradation by direct
sun-light: DT50 values for degradation in air are estimated by
calculation to be in the range 42 to 73 days. The products arising from
photo-oxidation are carbon dioxide and hydrogen chloride. Field
measurements confirmed that the photo-degradation in the atmosphere
prevents the global distribution and the atmospheric enrichment of
emissions, released by industry mainly in the northern hemisphere.
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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