Registration Dossier
Registration Dossier
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EC number: 201-170-0 | CAS number: 79-03-8
Adsorption / desorption
Administrative data
Link to relevant study record(s)
Description of key information
Parent compound propionyl chloride and hydrolysis product propionic acid: Adsorption to solid soil phase is not expected.
However, the assessment of the adsorption potential of the parent compound may be of low relevance, due to the rapid hydrolysis of the acid chloride in aqueous solutions.
Key value for chemical safety assessment
Additional information
Parent compound propionyl chloride:
The adsorption potential of propionyl chloride (CAS 79 -03 -8) was calculated using EPI Suite v.4.10. The estimation for the uncharged molecules using the MCI and the Kow method of the KOCWIN v2.00 module from SRC EPISuite v4.10 are listed below.
Propionyl chloride (CAS 79 -03 -8) rapidly decomposes in water and forms HCl (CAS 7647 -01 -0) and propionic acid (CAS 79 -09 -4).
Therefore, the model calculation may be of low relevance.
Uncharged molecule:
- MCI method: Koc = 1.5; log Koc = 0.18
- Kow method: Koc = 5.1; log Koc = 0.71
Based on the MCI method of the uncharged molecule, adsorption to solid soil is not expected.
Hydrolysis compound propionic acid (CAS 79 -09 -4):
The adsorption potential was estimated for propionic using the MCI and the Kow methods of the KOCWIN v2.00 module from SRC EPI Suite v4.10. These estimates are representative for uncharged molecules. The substance ionises in aqueous solutions, therefore the adsorption coefficient was calculated according to Franco & Trapp (2008) to correct for the charged molecule at pH 4, 5, 7 and 9. The Koc values are listed below.
Uncharged molecule:
- MCI method: Koc = 1.4; log Koc = 0.16
- Kow method: Koc = 2.2; log Koc = 0.34
Charged molecule:
- Franco & Trapp, 2008:
pH 4: Koc = 27; log Koc = 1.43
pH 5: Koc = 27; log Koc = 1.43
pH 7: Koc = 40; log Koc = 1.60
pH 9: Koc = 40; log Koc = 1.60
Based on the corrections for the charged molecule according to Franco & Trapp (2008), adsorption to the solid soil phase is not expected.
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