Registration Dossier
Registration Dossier
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Reaction mass of disodium 4-amino-6-[[4-[(2,4-diaminophenyl)diazenyl]phenyl]]-3-((E)-[4-((E)-(2,4-diaminophenyl)diazenyl]phenyl )diazenyl)-5-hydroxynaphthalene-2,7-disulphonate and disodium 4-amino-6-((E)-(4-aminophenyl)diazenyl)-3-((E)-(4-((E)-(2,4-diaminophenyl)diazenyl)phenyl)diazenyl)-5-hydroxynaphthalene-2,7-disulfonate
EC number: 951-695-0 | CAS number: -
Adsorption / desorption
Administrative data
Link to relevant study record(s)
Description of key information
The data for similar substance of Direct Black 19 are :
log Koc, soil, pH 5.6, 25°C= 2.42
log Koc, sludge, pH 5.6, 25°C=2.39
log Koc, soil, pH 7.4, 25°C = -0.07
log Koc, sludge, pH 7.4, 25°C = -0.52
Key value for chemical safety assessment
- Koc at 20 °C:
- 12.6
Additional information
A study (VUOS, 2011) was performed to estimate the adsorption coefficient Koc of similar substance on soil and sludge by means of HPLC method, following EU C.19. Log Koc for both soil and sludge are less than 3 for pH 5.6 at 25°C and negative at pH 7.4, showing very low potential of adsorption of the tested substance.
No significant influence of the counterion can be estimated on this result.
The value of 1.1 has been set as the minimum log Koc value accepted by EUSES to perform the risk assessment.
[LogKoc: 1.1]
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