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EC number: 947-726-2 | CAS number: -
No experimental data are available for the target substance Di-C12-18 alkyldimethyl ammonium chloride. Based on structural similarities, a read-across from DODMAC and DHTDMAC is considered to be appropriate. A justification for read-across is attached to IUCLDI section 13.
Adsorption of quaternary ammonium compounds seems (QAC) to occur mainly by an ion-exchange mechanism and depends on cation-exchange capacity of the sorbent and variety of other parameters. An estimation of Koc using using EpiSuite v4.11, KOCWIN v2.00 is not reliable, since the training set for the Koc estimation of this program did not include any QACs. Therefore, the Koc estimate is outside the program's prediction domain.
DHTDMAC adsorbs onto both the mineral and the organic fraction of soil and sediments. Kappeler (1982) found that on average 27% of the DHTDMAC in river water is adsorbed onto suspended matter (mean 22 mg/L suspended solids). The Kpsusp is calculated to 16,800 L/kg from these values.
This demonstrates that DHTDMAC can be bound very strongly by some minerals, while in others relatively small distribution constants were estimated. Under environmental conditions, the sorption properties of DHTDMAC probably vary in a wide range depending on the nature of the adsorbant.
For exposure assessment purpose, a value of 10,000 L/kg dw is chosen for both Kpsed and Kpsoil.
With an assumed Kpsusp of 10,000 l/kg and a concentration of 15 mg suspended matter per litre river water, about 87% of the DHTDMAC would remain in the water phase. Kappeler (1982) found that in river water on average 27% of the DHTDMAC is adsorbed onto suspended matter (average concentration 22 mg/L). From these values, the Kpsusp is calculated to 16,800 L/kg. As the latter value has a better empirical basis, it is used in the exposure calculation.
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