Registration Dossier
Registration Dossier
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EC number: 431-060-1 | CAS number: 153719-38-1
Adsorption / desorption
Administrative data
Link to relevant study record(s)
Description of key information
The adsorption/desorption characteristics of CA 2343 was studied in activated sludge of a waste water treatment plant at a concentration of 1 g suspended solids/L.
The initial test concentration was about 1.20 mg 14C-CA 2343/L. The reference item, acid red 88, had a concentration of 18.9 mg/l (extinction 0.98).
Duplicate samples from the supernatant were taken after 0, 3 and 24 hours of incubation. After centrifugation, the clear solutions were used for the determination of the test concentration by radiocounting (LSC). Furthermore, these solutions were analyzed by HPLC.
The adsorption of 14C-CA 2343 was low, not exceeding 4.4 % of the initial amount applied. However, the adsorption of the reference item was 93.2 % after 24 hours of adsorption, showing the validity of the test. In the blank samples no radioactivity was detected.
A distribution coefficient of 16.7 l/kg for the adsorption of 14C-CA 2343 to sewage sludge was calculated and related to the organic carbon content of the sewage sludge resulting in a Koc value of 59.2 l/kg
Key value for chemical safety assessment
- Koc at 20 °C:
- 59.2
Additional information
Guideline Test Type |
Species |
Koc (20 °C) |
Reference |
Reliability
|
ISO guideline for the adsorption/desorption of activated sludge |
Not applicable |
59.2 |
Vökl, W., Syngenta, 2001 |
Reliable without restrictions |
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