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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Additional information

1,2-Dichloropropane undergoes reactions with hydroxyl radicals in the atmosphere. The calculated half-life of 1,2-dichloropropane due to this reaction is 34.9 days at based on an OH radical concentration of 5E5 OH/cm3, a 24 hour photoday, and an overall OH-rate constant of 4.6E-13 cm3/molecule-sec (298 K). Direct photolysis is not an important process.

Hydrolysis is not expected to be an important removal process for 1,2-dichloropropane. The half-life for this reaction in water (pH 6.9) is 283 months at 25 C (Milano et al., 1988). Hydrolysis products detected include 1-chloro-2-propanol and hydrochloric acid. The reaction is faster in seawater (pH 8.3) with a half-life of 60 months at 25 C.

Direct photolysis of 1,2-dichloropropane in water is not likely to be a significant removal process, since the molecule does not have chromophores which absorb wavelengths > 290 nm.

The results of biodegradation screening tests are variable. 1,2-Dichloropropane was not degraded in the Zahn-Wellens Test for inherent biodegradability. No degradation was also observed in the Modified MITI Test (301C). However, based on the supporting studies, 1,2-dichloropropane is susceptible to biodegradation under aerobic conditions when incubated with adapted cultures, particularly those containing microbial oxygenase enzymes with broad substrate specificity.

1,2-Dichloropropane was degraded in water and sediment by naturally occurring organisms under anaerobic conditions. Studies conducted with sediments from Red Cedar Creek demonstrated stochiometric conversion to propene after 4 months of incubation. Based on these results, the estimated half-life in surface sediments is 60 days at 25 C.

Half-lives for the dissapation of 1,2-dichloropropane in soils range from 41 to 69 days (average 52 days) at 15C. Based on the release rates of water extractable inorganic chloride, the complete degradation of 1,2-dichloropropane is slow.

Bioaccumulation of 1,2-dichloropropane does not appear to occur to a significant extent.  Measured bioconcentration factors (BCF) ranged from 0.5 to 6.9.

Soil adsorption coefficients (Koc) for 1,2-dichloropropane have been calculated using various equations based on the relationship between Koc and either water solubility or octanol-water partition coefficient. Reported values for Koc range from 46.9 to 299.14. The value estimated using a widely accepted quantitative structure activity relationship was taken as the key parameter (Koc = 60.3).

The Henry’s Law constant for 1,2-dichloropropane has been measured experimentally at different temperatures. The experimental values were generally consistent and in excellent agreement with calculated values. The measured value of 2.82 x 10e-3 atm-m3/mol at 25 C was taken as representative.