Registration Dossier
Registration Dossier
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EC number: 203-943-8 | CAS number: 112-18-5
Endpoint summary
Administrative data
Description of key information
Additional information
ADSORPTION/DESORPTION
Cationic surfactants like the registration substance sorbs strongly to solid phases by van der Waals as well as ionic interactions of the protonated nitrogen. As no data for the registration substance is available read-across to the measurements for 1 -Octadecyl amine is carried. For 1 -Octadecyl amine an Adsorption/Desorption Test with 14C material according OECD 106 was carried out (see IUCLID 5.4.1) using two different soils, one sediment and one activated sludge.
Table Partitioning coefficents Kd / log Koc at lowest tested pore water concentration
| Type | Value | Temperature | % Org. carbon | Remarks |
|---|---|---|---|---|
| Kd Cranfield 164 soil in L/kg | 243 | 20 °C | 3.8 | for lowest pore water conc. at ads. equilib. 9 µg/L |
| Kd Cranfield 266 soil in L/kg | 409 | 20 °C | 1.5 | for lowest pore water conc. at ads. equilib. 8 µg/L |
| Kd Sediment OVP in L/kg | 600 | 20 °C | 2.4 | for lowest pore water conc. at ads. equilib. 5 µg/L |
| Kd Activated sludge DB in L/kg | 693 | 20 °C | 30.1 | for lowest pore water conc. at ads. equilib. 5 µg/L |
| log Koc Cranfield 164 soil | 3.805 | 20 °C | 3.8 | for lowest pore water conc. at ads. equilib. 9 µg/L |
| log Koc Cranfield 266 soil | 4.436 | 20 °C | 1.5 | for lowest pore water conc. at ads. equilib. 8 µg/L |
| log Koc Sediment OVP | 4.398 | 20 °C | 2.4 | for lowest pore water conc. at ads. equilib. 5 µg/L |
| log Koc Activated sludge DB | 3.362 | 20 °C | 30.1 | for lowest pore water conc. at ads. equilib. 5 µg/L |
AIR/WATER PARTITIONING - HENRY'S LAW CONSTANT
Henry's Law Constant Dimensionless Henry Law Constants (HLCs) for members of the DMA category can be estimated with US EPA HENRYWIN Program (v3.20). Using the bond contribution method, dimensionless HLCs range from 0.0191 (C10-DMA) to 0.184 (C18-DMA). However, due to the high pKa value, DMA category members will be almost fully protonated in aquatic environments. Therefore, HLCs were estimated with the same method for the protonated forms (DMA hydrochlorides) and ranged from 1.21E-09 (C10-DMA hydrochloride) to 1.16E-08 (C18-DMA hydrochloride), indicating negligible volatilisation from surface waters. The same conclusion has also been reached with the OECD SIDS for C12-DMA. OECD SIDS N,N-Dimethyldodecylamine. CAS No: 112-18-5 SIDS Initial Assessment Report for SIAM 11. Orlando, United States, 23-26 January 2001.
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