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EC number: 696-616-8 | CAS number: 1268344-02-0
Adsorption / desorption
Administrative data
Link to relevant study record(s)
Description of key information
The adsorption desorption potential of tallow based diamine ethoxylate was investigated in a adsorption desorption screening test performed according to OECD 106, the study fulfilled GLP requirements. The study which was performed with three soils shows that the adsorpion is to soils are strong and that the adsorption correlates with the CEC but not with organic content of soils. The results showed that diamine ethoxylates adsorb stronger to clay soils and less to sandy soils. Sorption ranges from 6219 to 91157 L/kg. The mean value of 43274 L/kg will be used for risk assessment purposes. Because there is a better relation ship with the CEC than with the organic matter content of the soils tested this mean Kd value is also used for sediment.
For the removal via adsorption to sludge the results as observed in the waste water treatment simulation test can be used.
Key value for chemical safety assessment
Other adsorption coefficients
- Type:
- log Kp (solids-water in soil)
- Value in L/kg:
- 4.636
Other adsorption coefficients
- Type:
- log Kp (solids-water in sediment)
- Value in L/kg:
- 4.636
Other adsorption coefficients
- Type:
- log Kp (solids-water in suspended matter)
- Value in L/kg:
- 4.937
Additional information
Due to the cationic surface-active properties will ethoxylated diamines adsorb strongly onto the solid phase of soil and sediments. These substances can adsorb both onto the organic fraction and, dependent on the chemical composition, onto the surface of the mineral phase, where sodium and potassium ions can be exchanged against the alkyl ammonium ion. The determination of a Koc from log Kow is not opportune, because the common equations for Koc derivation are not valid for both ionic and surface active substances.
An adsorption/desorption study was performed according to OECD 106 using three soils with different organic carbon content and CEC value. Distribution constants ranging from 6219 to 91157 L/kg were observed. There seems no relationship between the organic carbon content of the soils and the measured distribution coefficients. The observed distribution coefficients seem to increase with with the clay content and CEC of the soils. F
rom the three distribution constants a mean Kd of 43274 L/kg is calculated.
Results of all 3 tested soils
Soil |
Clay (%) |
Silt (%) |
Sand (%) |
CEC (meq/100g) |
pH |
Org C (%) |
Caq (µg/l) |
Kd (104cm3/g) |
Koc (106cm3/g) |
Speyer2.2 |
6.4 |
12.2 |
81.4 |
10 |
5.4 |
2.16 |
158 |
0.6219 |
0.27 |
Eurosoil 4 |
20.3 |
75.7 |
4.1 |
17.3 |
6.8 |
1.31 |
40 |
3.2445 |
2.5 |
Speyer6S |
42.1 |
36.0 |
21.9 |
22 |
7.2 |
1.75 |
13 |
9.1157 |
4.9 |
For the prediction of the partitioning of the oleyl and tallow based ethoxylated diamines in soil, sediment and suspended matter not the Kd based on organic matter will used but the uncorrected Kd because there is no relation between the organic matter concentration and the sorption observed.
The mean Kd value for the three soils of 43274 L/kg will be used as a realistic worst-case to derive the distribution constants for the ethoxylated alkyl-1,3-diaminopropanes. Because there is no principal difference between soil and sediments considering the sorption properties and because for cationic surfactants the degree of sorption is not related to the organic carbon content, the value for soil will also be used for sediment and suspended particles. For sludge which consists mainly of organic matter the sorption data as observed for soil are not considered to be representative. This is however not a serious problem because the removal by sorption in a waste water treatment plant will be close to what is observed in the waste water treatment simulation test i.e. 3.8% removal.
In the table below, the distribution constants used in this assessment are summarized:
Table: Distribution constants for ethoxylated alkyl-1,3-diaminopropanes
Kpsoil |
43274 L.kg-1 |
Ksoil-water |
64912 m3.m-3 |
Kpsusp |
86548 L.kg-1 |
Ksusp-water |
21638 m3.m-3 |
Kpsed |
43274 L.kg-1 |
Ksed-water |
21638 m3.m-3 |
With a Kpsuspof 86548 L/kg and a concentration of 15 mg/L suspended matter in surface waters, the adsorbed fraction is calculated as 56.5%.
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