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Environmental fate & pathways

Adsorption / desorption

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Reference
Endpoint:
adsorption / desorption: screening
Type of information:
experimental study
Adequacy of study:
key study
Study period:
30/07/2012-05/10/2012
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: GLP comparable to OECD guideline
Reason / purpose:
reference to same study
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))
Principles of method if other than guideline:
/
GLP compliance:
yes
Type of method:
HPLC estimation method
Media:
soil/sewage sludge
Specific details on test material used for the study:
Details on properties of test surrogate or analogue material (migrated information):
/
Radiolabelling:
no
Test temperature:
40°C
Details on study design: HPLC method:
EQUIPMENT
- Apparatus: Agilent Series 1100/1200 HPLC
- Type, material and dimension of analytical (guard) column:Zorbax CN column (150 mm x 4.6 mm x 5 µm particle size)
- Detection system: Agilent Series 1200 varibale wavelength UV detector

MOBILE PHASES
- Type: Gradient mobile phase consisting of HPLC-grade Reagent Water and methanol (Initial 55% MeOH, 45% H2O).
- Experiments with additives carried out on separate columns: no
- pH:6
- Solutes for dissolving test and reference substances:Test substance in acetonitrile, Reference substances in acetonitrile or methanol

DETERMINATION OF DEAD TIME
- Method:by inert substances which are not retained by the column (injection of thiourea)

REFERENCE SUBSTANCES
- Identity: Bromobenzene, napthalene (99%), 1,2,4-trichlorobenzene, phenanthrene (98%), 1,1-Bis(4-chlorophenyl)-2,2,2-trichloroethane (98% 4,4 DDT)

DETERMINATION OF RETENTION TIMES
- Quantity of test substance introduced in the column:10.0 mg/L and 50.0 mg/L
- Quantity of reference substances: 10-40 mg/L
- Intervals of calibration: none

REPETITIONS
- Number of determinations:3 at a concentration of 10.0 mg/L

EVALUATION
- Calculation of capacity factors k': k' = (tR-t0)/t0 where tR: retention time of the test substance or reference standard peak and t0: column dead time
- Determination of the log Koc value: calculated as follows:
log Koc = (log k' - Y intercept)/slope
Type:
log Koc
Value:
5.33
Temp.:
40 °C
Remarks on result:
other: First peak
Type:
log Koc
Value:
> 5.63
Temp.:
40 °C
Remarks on result:
other: second peak
Type:
log Koc
Value:
> 5.63
Temp.:
40 °C
Remarks on result:
other: Third peak
Details on results (HPLC method):
- Retention times of reference substances used for calibration:
Thiourea: 1.956-1.960 min
Acetanilide: 2.566-2.624 min
Phenol: 2.695-2.688 min
Bromobenzene: 4.408-4.550 min
Napthalene: 5.377-5.445 min
1,2,4-TCB: 6.222-6.579 min
Phenanthrene: 9.815-10.409 min
- Details of fitted regression line (log k' vs. log Koc): R²= 0.9674, y=0.3359x-0.7650
- Graph of regression line attached: yes
- Average retention data for test substance: Peak 1: 22.72 min, Peak 2: 33.92 min, Peak 3: 34.23 min
Validity criteria fulfilled:
yes
Conclusions:
Under the chromatographic conditions specified, Brominated Epoxy eluted as three discrete peaks. According to the Sponsor, the test substance is a mixture in which the main component is n = 1. The mean log KOC for the first test substance peak (n = 1) was determined to be 5.33 ± 0.011 log units (N = 3, CV = 0.21%). The mean log KOC for the second and third test substance peaks (n = 2 and 3, respectively) were both determined to be greater than 5.63 using the HPLC estimation method.

Description of key information

log Koc for brominated Epoxy

Key value for chemical safety assessment

Koc at 20 °C:
213 796

Additional information

Under the chromatographic conditions specified, Brominated Epoxy eluted as three discrete peaks. The mean log Koc for the first test substance peak was determined to be 5.33 ± 0.011 log units (N = 3, CV = 0.21%). The mean log Koc for the second and third test substance peaks were both determined to be greater than 5.63 using the HPLC estimation method.

[LogKoc: 5.33]