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EC number: 449-400-0
CAS number: 25822-43-9
The adsorption/desorption coefficient Koc of the test item was assessed using an HPLC method. The test item concentration was 4.3 mg/L mobile phase. The experimentally derived log Koc was 6.49 with pH 7.2 at 35°C.
adsorption/ desorption coefficient Koc of the test item was assessed
using an HPLC method according to OECD 121, adopted in 2001. HPLC
analysis is performed on an analytical column packed with a commercially
available cyanopropyl solid phase, based on a silica matrix, containing
lipophilic and polar moieties. 15 µL of the test item solution (4.3
mg/L mobile phase) were injected onto the column. The test item moves
along the column at different rates because of the different degrees of
partitioning between the mobile phase and the stationary phase. This
enables to establish the relationship between the retention time on the
column and the adsorption coefficient on organic matter. The retention
time of the oligomer n= 2 was determined in duplicate and the capacity
factor k was calculated. The assay was performed with pH 7.2 at 35°C. 6
reference compounds were included. The adsorption coefficient is defined
as the ratio between the concentration of the substance in the soil/
sludge and the concentration of the substance in the aqueous phase at
the adsorption equilibrium. The estimated calculated logKoc was 6.5 at
pH 7.2 (PCKOCWIN). This corresponds to a Koc = 3.23 x 10E06.The
experimentally derived logKoc which was deduced from the capacity factor
k' using a calibration plot of log k' versus log Koc of the reference
compounds, was 6.49 at pH 7.2 and 35°C. This corresponds to a Koc = 3.1
Based on this result it is estimated that the test item is not free
dissolved in water but adsorbs to organic material.
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