Registration Dossier
Registration Dossier
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EC number: 269-133-1 | CAS number: 68187-89-3
Adsorption / desorption
Administrative data
Link to relevant study record(s)
Description of key information
The parent compounds hydrolyse rapidly in wet environments and form the corresponding acids and HCl.
Hydrolysis products: Adsorption to the solid soil phase is expected at pH <= 7. Adsorption to the solid soil phase is not expected at pH > 7.
Key value for chemical safety assessment
Additional information
A study is not required for this tonnage band.
Acid chlorides, coco
The substance is a mixture of the following components which hydrolyse rapidly in water to form HCl (CAS 7647-01-0) and the corresponding acid.
1) Lauroyl
chloride (CAS 112-16-3): >=30 to <=70%
(hydrolysis product: lauric acid, CAS 143-07-7)
2)
Tetradecanoyl choride (myristoyl chloride; CAS 112-64-1): >=10 to <=30%
(hydrolysis product: myristic acid, CAS 544-63-8)
3)
Palmitoyl chloride (CAS 112-67-4): >=1 to <=20%
(hydrolysis product: palmitic acid, CAS 57-10-3)
4) Decanoyl chloride (CAS 112-13-0): >=1 to <=15%
(hydrolysis product: decanoic acid, CAS 334-48-5)
5) Stearoyl chloride (CAS 112-76-5): >=1 to <=15%
(hydrolysis product: stearic acid, CAS 57-11-4)
6) Octanoyl chloride (CAS 111-64-8): <=1 to <=10%
(hydrolysis product: octanoic acid, CAS 124-07-2)
Parent compounds:
The parent compounds hydrolyse rapdily in wet environments and form the corresponding acids and HCl.
Hydrolysis products (acyl halides):
The adsorption potential was estimated 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 5, 7, 8 and 9. Depending on the C-chain length, the Koc values vary as follows:
Uncharged molecule:
- MCI method: Koc = 29 - 11700; log Koc = 1.46 - 4.07
- Kow method: Koc = 70 - 51050; log Koc = 1.84 - 4.71
Charged molecule:
- Franco & Trapp, 2008:
pH 5: Koc = 408 - 51116; log Koc = 2.61 - 4.71
pH 7: Koc = 85 - 5723; log Koc = 1.93 - 3.76
pH 8: Koc = 76 - 367; log Koc = 1.88 - 2.56
pH 9: Koc = 75 - 219; log Koc = 1.87 - 2.34
Based on the corrections for the charged molecule according to Franco & Trapp (2008), adsorption to the solid soil phase is expected at pH 7 and lower, especially for the longer-chained molecules. At pH values above 7, adsorption to the solid soil phase is not expected. Moreover, the hydrolysis products are considered to be readily biodegradable.
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