Registration Dossier

Administrative data

Endpoint:
adsorption / desorption: screening
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2008
Reliability:
1 (reliable without restriction)

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2008
Report Date:
2008

Materials and methods

Test guidelineopen allclose all
Qualifier:
according to
Guideline:
OECD Guideline 121 (Estimation of the Adsorption Coefficient (Koc) on Soil and on Sewage Sludge using High Performance Liquid Chromatography (HPLC))
Qualifier:
according to
Guideline:
EU Method C.19 (Estimation of the Adsorption Coefficient (KOC) on Soil and Sewage Sludge Using High Performance Liquid Chromatography (HPLC))
GLP compliance:
yes (incl. certificate)
Type of method:
HPLC estimation method

Test material

Reference
Name:
Unnamed
Type:
Constituent
Details on test material:
- Sponsor’s identification: Uvasorb HEB
- Description: off-white powder
- Lot number: 1508G21
- Data received: 11 September 2008
- Storage conditions: room temperature, in the dark

Study design

Batch equilibrium or other method

Analytical monitoring:
yes

Results and discussion

Adsorption coefficientopen allclose all
Type:
Koc
Value:
> 427 000
Type:
log Koc
Value:
> 5.63

Any other information on results incl. tables

The method guideline states that the measurement of adsorption coefficient should be carried out on substances in their ionised and unionised forms. However, the dissociation constants found in the test material (-2.38, -1.49, 3.04, 15.3) made it impossible to satisfy this criterion, as testing would be required at below pH 3 and greater than pH 14. Therefore, as these pHs are outside the environmental pH range for this test and also experimentally impractical, testing was carried out at approximately neutral pH with the functional groups unionised.

Applicant's summary and conclusion

Conclusions:
The adsorption coefficient (Koc) of the test material has been determined to be > 4.27*10^5, logKoc > 5.63