Use of this information is subject to copyright laws and may require the permission of the owner of the information, as described in the ECHA Legal Notice.
EC number: 200-817-4
CAS number: 74-87-3
In Annex X of the Regulation (EC) No
1907/2006 REACH concerning the Registration, Evaluation, Authorisation
of Chemicals (REACH), it is suggested, that "in the absence of toxicity
data for soil organisms, the equilibrium partitioning method may be
applied to assess the hazard to soil organisms. The choice of the
appropriate tests depends on the outcome of the chemical safety
assessment. In particular for substances that have a high potential to
adsorb to soil or that are very persistent, the registrant shall
consider long-term toxicity testing instead of short-term.
Chloromethane is gaseous and the primary
environmental compartment to which it partition is air. In accordance
with REACH regulation, the studies need not to be conducted if exposure
to soil and sediment is unlikely. Volatilization of chloromethane from
moist soil surfaces is expected to be an important fate process.
Considering its solubility, volatility and resultant Henry’s Law
Constant, chloromethane is expected, under equilibrium conditions, to
exist principally in the air. Mackay Level III simulations were used to
evaluate the effect of source of entry on the distribution and
persistence of chloromethane. As expected; the emission of chloromethane
directly to air resulted in > 99% of the total chemical mass residing in
the air compartment. Only insignificant amounts of chloromethane will be
found in the soil or sediment compartments, regardless of source of
entry to the environment. Since chloromethane is a gas, most industrial
releases are expected to be directly to the air compartment. In a study
from Brahusi et al. (2002) to investigate the behaviour of chloromethane
in arable soil, the results showed clearly that volatilization is the
main loss mechanism of chloromethane from soil (69.2-70.9% within 3 -4
days). This is in accordance with another study from Wang (1994), who
reported also volatilization from soil as main loss pathway.
Additionally, the substance is not expected to adsorb to soil based upon
the log Koc.
The substance is readily biodegradable, has a
low potential for adsorption and does not bioaccumulate. These
characterists suggest a small hazardous potential towards soil
organisms. Therefore, the equilibrium partitioning method has been used
to assess the hazard potential of chloromethane for soil organisms.
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.
Welcome to the ECHA website. This site is not fully supported in Internet Explorer 7 (and earlier versions). Please upgrade your Internet Explorer to a newer version.
Do not show this message again