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EC number: - | CAS number: -
Adsorption / desorption
Administrative data
Link to relevant study record(s)
Description of key information
Koc = 58119 L/kg (geometric mean of 5 soils), OECD guideline 106, GLP
Key value for chemical safety assessment
- Koc at 20 °C:
- 58 119
Additional information
The adsorption and desorption of DOPA-Glycinate was investigated according to OECD guideline 106. The study was performed using 14C-labelled representative lead components (C12 moiety) of the test substance. The average adsorption/desorption behaviour of the test substance was determined by measuring total 14C-radioactivity without differentiation of the single components of the test substance. Five soils with different content of organic carbon and clay were selected. The adsorption of the test substance onto each of the five soils was a rapid process: The results of the adsorption kinetics revealed that in most cases the adsorption equilibrium was reached already after 1 hour. Percentage of adsorbed 14C-radioactivity (mean values) were in the range of 85.8 % to 96.0 %. Calculated adsorption coefficients (KFads) were in the range of 853.3–2428.8
The desorption experiments showed that the adsorption was only marginally reversible. Only 4.7–7.7 % of the adsorbed test substance were desorbed. Calculated desorption coefficients (KFdes) were in the range of 1350.2–3183.5. According to SSLRC mobility classification, DOPA-Glycinate can be classified as non-mobile (KOC> 4000 mL/g).
Adsorption/desorption of DOPA-Glycinate to/from soils:
Guideline/ test method: OECD 106, EU C. 18 |
Adsorbed a.s. (%) |
Ka1 |
KaOC2 |
Kd3 |
KdOC4 |
Ka/Kd5 |
|
Soil 1:LUFA no.2.2, loamy sand |
92.7 |
1254.9 |
54561 |
3183.5 |
138413 |
0.39 |
|
Soil 2:Marisfeld, clay loam |
94.5 |
1296.6 |
51864 |
2110.6 |
84424 |
0.61 |
|
Soil 3:Osnabrück, loamy sand |
95.2 |
2428.80 |
86743 |
2654.0 |
94786 |
0.91 |
|
Soil 4:Ebbinghof, silt loam |
92.7 |
1203.1 |
31660 |
1350.2 |
35532 |
0.89 |
|
Soil 5:Borstel, sandy Loam |
91.5 |
853.3 |
85330 |
1352.7 |
135270 |
0.63 |
|
1) Ka= Adsorption coefficient;
2) KaOC= Adsorption coefficient based on organic carbon content;
3)Kd= Desorption coefficient;
4) KdOC= Desorption coefficient based on organic carbon content;
5) Ka/Kd= Adsorption / Desorption distribution coefficient
From the KOC values for adsorption (KaOC) reported in the table above, the mean normalised KOC relevant for risk assessment is calculated as
KOC(geometric mean) = 58,119
Applying the formula
Kpcomp=Foc× Koc
according to the TGD, the following partition coefficients for soil, sediment and suspended matter were estimated:
Kpsoil= 1164
Kpsed= 2910
Kpsusp= 5820
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