Registration Dossier

Environmental fate & pathways

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.