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EC number: 444-370-5
CAS number: 669005-94-1
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.
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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