Registration Dossier
Registration Dossier
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EC number: 444-370-5 | CAS number: 669005-94-1
Adsorption / desorption
Administrative data
Link to relevant study record(s)
Description of key information
The log of the adsorption coefficient (Koc) was estimated to be log Koc > 5.63 which is equal to a KOC value of > 426580 using the HPLC method. Therefore, adsorption to solid soil phase is expected.
Key value for chemical safety assessment
Additional information
The determination of the adsorption coefficient (KOC) of the test item was performed according to the OECD Guideline for the Testing of Chemicals, 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 (Rcc Ltd. 2004b). 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 found to be 6.59 which is equal to a KOC value of 3933678. In 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, the 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 the test item in the HPLC-chromatogram was longer than the retention time of the highest standard used. In conclusion,
the log of the adsorption coefficient (Koc) of the test item was estimated to be log Koc > 5.63 which is equal to a KOC value of > 426580 using the HPLC method. This value indicates that test item is immobile in soil.
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