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Adsorption / desorption

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Reference
Endpoint:
adsorption / desorption: screening
Type of information:
experimental study
Adequacy of study:
key study
Study period:
26 September 2017 to ****
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
OECD Guideline 121 (Estimation of the Adsorption Coefficient (Koc) on Soil and on Sewage Sludge using High Performance Liquid Chromatography (HPLC))
Deviations:
no
GLP compliance:
yes
Type of method:
HPLC estimation method
Media:
sewage sludge
Specific details on test material used for the study:
Physical state: Dark amber liquid
Purity: >93 %
Test temperature:
25 °C
Details on study design: HPLC method:
UV detection: 210 nm
Key result
Type:
log Koc
Value:
< 5.61 dimensionless
pH:
5
Temp.:
25 °C
Remarks on result:
other: same result at pH 7 and 9

 The retention time for the test substance was greater than that of DDT for pH 5, 7 and 9 and when the result was extrapolated based the calibration line, the mean log Koc was 6.5 for pH 5, 7 and 9. This demonstrates that the pH had no effect on the adsorption coefficient. The standard with the highest log Koc is DDT at 5.63 so no degree of certainty can be attached to the extrapolated value of 6.5 value. The log Koc is therefore considered to be >5.63.

Validity criteria fulfilled:
yes
Conclusions:
The adsorption coefficient of the test material has been determined to have a log Koc of greater than 5.63.
Executive summary:

In a study performed to the standardised guideline OECD 121, under GLP conditions; the adsorption coefficient of the test material has been determined to have a log Koc of greater than 5.63, Smithers Viscient (ESG) Ltd (2018).

Description of key information

In a study performed to the standardised guideline OECD 121, under GLP conditions; the adsorption coefficient of the test material has been determined to have a log Koc of greater than 5.63, Smithers Viscient (ESG) Ltd (2018).

Key value for chemical safety assessment

Additional information