Registration Dossier
Registration Dossier
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EC number: 431-920-4 | CAS number: -
Adsorption / desorption
Administrative data
Link to relevant study record(s)
Description of key information
The adsorption coefficient of the structural analogue indigo was log Koc = 2.85
Key value for chemical safety assessment
- Koc at 20 °C:
- 707.95
Additional information
The adsorption coefficient of the structural analogue indigo was determined according to the HPLC method described in guideline 67/548 EEC, annex C.19.
The adsorption coefficient of the test item was found to be: 2.85
Indigo suspension adsorbs to 88% to 97% to activated sludge of sewage treatment plants. It is therefore effectively eliminated by sewage treatment plants.
Table Adsorption of Indigo to activated sludge
Indigo concentration in suspension [mg/L] |
Extinction of Indigo suspension prior to adding activated sludge |
Extinction of Indigo suspension after treatment |
Adsorption to activated sludge [%] |
114 |
0.423 |
0.052 |
88 |
285 |
1.056 |
0.040 |
96 |
570 |
2.112 |
0.060 |
97 |
[LogKoc: 2.85]
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