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Environmental fate & pathways

Adsorption / desorption

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Reference
Endpoint:
adsorption / desorption: screening
Type of information:
read-across from supporting substance (structural analogue or surrogate)
Adequacy of study:
key study
Justification for type of information:
REPORTING FORMAT FOR THE ANALOGUE APPROACH : Please see attached Read Across supporting document in Section 13 which includes the following:
1. HYPOTHESIS FOR THE ANALOGUE APPROACH
2. SOURCE AND TARGET CHEMICAL(S) (INCLUDING INFORMATION ON PURITY AND IMPURITIES)
3. ANALOGUE APPROACH JUSTIFICATION
4. DATA MATRIX
Reason / purpose:
read-across source
Key result
Type:
log Koc
Value:
> 5
pH:
6.5
Temp.:
25 °C
Matrix:
Soil
Remarks on result:
other:
Remarks:
5.014 ± 1.309
Key result
Type:
log Koc
Value:
> 5
pH:
6.5
Temp.:
25 °C
Matrix:
Sludge
Remarks on result:
other:
Remarks:
6.052 ± 1.834
Conclusions:
Based on read across to an analogue substance, estimations of the adsorption coefficients (Koc) at pH 6.5 and 25 °C were log Koc >5 (5.014 ± 1.309)
and log Koc >5 (6.052 ± 1.834) on soil and sewage sludge, respectively.
Executive summary:

The adsorption coefficient of an analogue substance, Solvent Red 19E, on soil and on sewage sludge was estimated using the HPLC method with reference compounds under GLP conditions. This substance differs from the target substance only with an ethylhexyl group in place of the tridecyl group.

Estimations of the adsorption coefficients (Koc) at pH 6.5 and 25 °C were log Koc >5 (5.014 ± 1.309)

and log Koc >5 (6.052 ± 1.834) on soil and sewage sludge, respectively.

Description of key information

Based on read across to an analogue substance, estimations of the adsorption coefficients (Koc) at pH 6.5 and 25 °C were log Koc >5 (5.014 ± 1.309) and log Koc >5 (6.052 ± 1.834) on soil and sewage sludge, respectively.

Key value for chemical safety assessment

Koc at 20 °C:
1 127 197

Additional information

The adsorption coefficient of an analogue substance, Solvent Red 19E, on soil and on sewage sludge was estimated using the HPLC method with reference compounds under GLP conditions. This substance differs from the target substance only with an ethylhexyl group in place of the tridecyl group.

Estimations of the adsorption coefficients (Koc) at pH 6.5 and 25 °C were log Koc >5 (5.014 ± 1.309)

and log Koc >5 (6.052 ± 1.834) on soil and sewage sludge, respectively.