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Environmental fate & pathways

Adsorption / desorption

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Administrative data

Endpoint:
adsorption / desorption: screening
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: The procedures used conformed to those outlined in EC Directive 2001/59/EC (and subsequent updates) Method C19 and OECD Guideline 121. The study has been done in GLP laboratory.

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2009
Report Date:
2009

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
Media:
soil

Test material

Reference
Name:
Unnamed
Type:
Constituent
Details on test material:
- Name of test material (as cited in study report): TAEE (tert-Amyl Ethyl Ether)
- CAS number: 919-94-8
- Physical state: Colourless mobile liquid at ambient room temperature
- Analytical purity: 99.4 %
- Impurities (identity and concentrations): Identified impurities are (wt-%): ethanol 0.02, diethyl ether 0.02, 2-methyl-2-butanol 0.07, C8-C10 ethers 0.03, C5-olefins 0.09, C9-C10 -olefins 0.27
- Purity test date: 9.10.2008
- Lot/batch No.: 00931302

Study design

Test temperature:
25 °C

Results and discussion

Adsorption coefficient
Type:
log Koc
Value:
> 2.16 - < 3.73

Any other information on results incl. tables

The test compound (TAEE) eluted as three peaks with retention times which were within the range of retention times of the calibration substances. Therefore the results of the estimation may be expected to be realistic, as the results were calculated by interpolation rather than extrapolation. The grouping of the three peaks was tight and consistent, and generated adsorption coefficient (log Koc) values between 2.16 and 3.73, with the 95% confidence range covering 1.74 to 4.12. 

Applicant's summary and conclusion

Conclusions:
The distribution coefficient on soil (expressed as log Koc) of TAEE (tert-Amyl Ethyl Ether) was estimated at 25°C to be between 2.16 and 3.73, all within a 95% confidence range of 1.74 to 4.12.
Executive summary:

The distribution coefficient on soil (expressed as log Koc) of TAEE (tert-Amyl Ethyl Ether) was estimated at 25°C using the HPLC simulation technique with a mobile phase of methanol and water, mixed 65 to 35 by volume. The test substance eluted as three components (ca 21%, 9% and 70% by area respectively) with retention times corresponding to mean log Koc values between 2.16 and 3.73, all within a 95% confidence range of 1.74 to 4.12. The reason for there being three observed peaks for the high-purity product is not understood, but may reflect an interaction with the stationary phase.