Registration Dossier
Registration Dossier
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EC number: 203-455-5 | CAS number: 107-03-9
Endpoint summary
Administrative data
Description of key information
Additional information
In accordance with column 2 of REACH Annex VIII, the adsorption/desorption study does not need to be conducted as based on the physico-chemical properties the substance can be expected to have a low potential for adsorption (the substance has a log octanol water partition coefficient less than 3).
A predicted Koc value was determined using the ‘non-hydrophobics’ log Kow-based prediction method for log Kocdeveloped by Sabljić and Güsten (1995) for the European Commission, and recommended in EU Guidance., as implemented in EUSES v 2.1.2:
log Koc = 0.52*log Kow + 1.02
Based on the key log Kow value of 1.7, the predicted Koc is 80.2 l/kg (log Koc = 1.9). The calculated value is considered suitable as a supporting study and for the environmental exposure assessment.
The Henry's Law constant for propane-1-thiol has been calculated to be 829.74 Pa-m3/mol at 25°C, based on vapour pressure of 20.7 kPa and water solubility of 1900 mg/l at 25°C and a molecular weight of 76.16 g/mol. This equation for calculating the Henry's Law Constant is indicated in the Guidance on information requirements and chemical safety assessment (IR & CSA) Chapter 16 "Environmental exposure estimate" (Equation R.16-4) and is therefore considered an appropriate technique. The calculated value is considered suitable for use for this endpoint. This result indicates that propane-1-thiol is expected to volatilise rapidly from the aquatic environment.
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