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Diss Factsheets

Administrative data

Endpoint:
adsorption / desorption
Remarks:
adsorption
Type of information:
experimental study
Adequacy of study:
key study
Study period:
1996-07-17 to 1996-07-19
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Procedure of the OECD 302B Guideline was applied, reporting is limited but results are plausible

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
1996
Report date:
1996

Materials and methods

Test guideline
Qualifier:
according to guideline
Guideline:
other: OECD 302B Sorption to sludge after 3h
Principles of method if other than guideline:
The Zahn-Wellens / EMPA Test according OECD Guideline 302B is a test to determine the Inherent biodegradability of test chemicals. Due to the high sludge to substance ratio sorption to the sewage sludge (inoculum) may be an important route of substance elimination in the test system which is unrelated to biodegradation. Therefore the Guideline requires a DOC estimation after 3h to check if sorption is relevant. Based on this requirement the Zahn-Wellens test design allows to check potential sorption to sewage sludge.
GLP compliance:
no
Type of method:
other: following OECD 302B
Media:
sewage sludge

Test material

Constituent 1
Chemical structure
Reference substance name:
4-methyl-6-(2,4,4-trimethylpentyl)-2H-pyran-2-one
EC Number:
610-555-6
Cas Number:
50650-75-4
Molecular formula:
C14H22O2
IUPAC Name:
4-methyl-6-(2,4,4-trimethylpentyl)-2H-pyran-2-one
Test material form:
other: test substance was dissolved in water and added to the sewage sludge
Details on test material:
Lot N 205 from 1996-02-20 was used as test substance
Radiolabelling:
no

Study design

Test temperature:
22 deg Celcisus

Batch equilibrium or other method

Analytical monitoring:
yes
Details on sampling:
after 3,5h the sludge suspension was filtrated an the filtrate analyzed
Details on test conditions:
Two test sets with 64 mg/L (46 mg/L Carbon), measured background concentration 1,6 mg/L Carbon and 1.5 mg/L Carbon
Duration of adsorption equilibrationopen allclose all
Sample No.:
#1
Duration:
3.5 h
Initial conc. measured:
41.5 other: mg/L Carbon
pH:
6.7
Sample No.:
#2
Duration:
3.5 h
Initial conc. measured:
40.5 other: mg/L Carbon
pH:
6.7

Results and discussion

Adsorption coefficient
Type:
other: % Absorption
Value:
10.9
Temp.:
22 °C
% Org. carbon:
37
Remarks on result:
other: pH 6.7

Results: Batch equilibrium or other method

Mass balance (%) at end of adsorption phaseopen allclose all
Sample no.:
#1
Duration:
3.5 h
% Adsorption:
9.8
Sample no.:
#2
Duration:
3.5 h
% Adsorption:
12
Transformation products:
not measured

Applicant's summary and conclusion

Validity criteria fulfilled:
yes
Conclusions:
The test setting of a Zahn-Wellens Test according OECD Guideline 302B was used to measure the adsorption of the test item to sewage sludge after 3.5 h at 22 deg C and pH 6.7. The average sorption to sewage sludge from two test sets was 10.9%.