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EC number: 202-486-1
CAS number: 96-18-4
According to the industrial users of 1,2,3-trichloropropane the
substance is to the greatest extent emitted into the wastewater and to a
minor extent into the atmosphere. The substance is soluble in water
(1750 mg/L at 25 °C). Based on the measured Henry’s Law Constant of 22.8
Pa x m3 x mol-1 (Tancrède and Yanagisawa 1990) it is expected that
1,2,3-trichloropropane has a moderate volatility from the aqueous phase.
Experimental data show that the half-life for stripping of
1,2,3-trichloropropane from water is between 1 and 1.5 hours (Dilling
1977, Albanese et al. 1987). A fraction of the substance dissolved in
wastewater will be released to the atmosphere in wastewater treatment
plants (SPI 2003). On the other hand, 1,2,3-trichloropropane may be
washed out from the atmosphere by wet deposition considering the water
solubility of 1,2,3-trichloropropane (WHO 2003). It is therefore
expected that exchange of the substance between the aquatic and
atmospheric environment occurs. The washing out of substance from the
atmosphere can also lead to deposition of 1,2,3-trichloropropane onto
soil. The adsorption/desorption behaviour of 1,2,3-trichloropropane was
studied using silty and sandy loam (Walton et al. 1992). The Koc values
resulting from the experiments were in the range of 77 to 95 indicating
the low ability of the substance for adsorption. These low values show
the high mobility of 1,2,3-trichloropropane in soil that may lead to the
appearance of the substance in groundwater.
Modelling of environmental distribution
The predominant environmental target compartments for
1,2,3-Trichloropropane are air (approximately 85 % of the emitted mass)
and water (about 11 %) if a Mackay Level I model with six compartments
is used to model the environmental distribution of the substance (Mackay
et al. 1993). The picture changes considerably when a Mackay Level III
model is used instead: the US Environmental Protection Agency modelling
program EPIWIN V3.10 Fugacity model under the assumption of evenly
distributed emissions (1000 kg/hr) into air, water and soil predicts
that the greatest portion of 46.7 % of 1,2,3-Trichloropropane will end
up in the soil compartment, whereas 34.9 % will end up in the water
compartment, 18.3 % in the air compartment and 0.12 % in the sediment
(SPI 2003). The model calculated a persistence time of 335 hours.
Recently, the environmental distribution of the substance was modelled
with the US Environmental Protection Agency modelling program EPIWIN
V4.0 Fugacity model by taking into account a more realistic emission
scenario, where the greatest emission was into the water (1000 kg/hr)
and less emission was into the air (100 kg/hr) and the soil (1 kg/hr)
(Wormuth 2009). Under these conditions the greatest portion of
1,2,3-Trichloropropane emitted into the environment ends up in the water
compartment (85.1 %) and the air compartment (13.6 %). Only minor
portions may be found in the soil and sediment compartments (0.65 and
0.64 %, respectively). The persistence time calculated by the model is
334 hours and thus similar to the time calculated before.
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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