Registration Dossier
Registration Dossier
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EC number: 400-920-6 | CAS number: 89857-06-7
Adsorption / desorption
Administrative data
Link to relevant study record(s)
Description of key information
Log Koc < 1.25 at 25 °C
Key value for chemical safety assessment
- Koc at 20 °C:
- 18
Additional information
The determination of the adsorption coefficient (Koc) of test item was performed according to the OECD Guideline, No. 121, Estimation of the Adsorption Coefficient (Koc) on Soil and Sewage Sludge using High Performance Liquid Chromatography (HPLC), January, 2001 and the EC Directive 2001/59, C.19.
The test item solution was injected three times and the combined reference solution was injected six times. The log Koc was calculated using a regression curve (log k' vs. log Koc) and was extrapolated to be -3.1 which is equal to a Koc value of 9 x 10-4. ln the present study the reference items covered the range of log Koc 1 .25 to log Koc 5.63.
The chromatography of the test item resulted in one main peak with a well-defined and reproducible retention time. The HPLC method was therefore considered to be suitable for the purpose of the study. Based on the chromatographic data, test item was considered to be stable during the test procedure.
The capacity factor (k') was calculated for each reference item using the retention times. Log Koc was plotted versus log k for each component to obtain a regression curve. The retention time of test item in the HPlC-chromatogram is shorter than the retention time of the lowest reference item used.
ln conclusion, the log of the adsorption coefficient (Koc) of test item was estimated to be log Koc < 1.25 which is equal to a Koc value of < 18 using the HPLC method. This value indicates that test item is mobile and will not be adsorbed by organic carbon in soil.
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