Registration Dossier
Registration Dossier
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EC number: 609-256-3 | CAS number: 365400-11-9
Adsorption / desorption
Administrative data
Link to relevant study record(s)
Description of key information
Koc: 19 - 899 (log Koc = 1.28– 2.95, ambient temperature, OECD 106)
Key value for chemical safety assessment
- Koc at 20 °C:
- 216.36
Additional information
The soil adsorption and desorption of the substance was
investigated on five soils of US and European origin and on one aquatic
sediment. Radiolabelled test item was used in a concentration of
approximately 0.45 to 0.006 mg/L, covering about two orders of
magnitude. The soils were pre-equilibrated for approximately 24 h with
0.01 M CaCl2 solution, and then applied with test item, and subjected to
one adsorption and two consecutive desorption cycles including complete
supernatant exchange for each. Optimal soil to solution ratios were
derived from a pre-test, and ranged from 1:1 to 1:20 (w/w) for the
different soils. Equilibration times were 24 h per cycle, based on
pre-test results. The experiments were carried out in the dark at
ambient temperature. For the tested soils, Koc of the test item is high
in acidic soils and decreases with increasing pH but seems to level off
at neutral pH values. This is in agreement with the acidic nature of the
test item. Freundlich adsorption exponents (1/n) are below 1.0 for all
tested soils and indicate favored soil sorption of the test item at
lower concentration. Koc for the two consecutive desorption cycles are
significantly (about 1.4 to 2.9 times) higher than those for adsorption.
Therefore, desorption of the substance from soil and sediment seems to
be hindered, and once adsorbed, the compound is not readily released
back into the aqueous phase. This effect was further characterized
employing a two-step Accelerated Solvent Extraction with
acetonitrile/water on the test item pre-adsorbed soil samples. For soils
Pikeville, Carlyle, Nidda sediment and HCB (i.e. the soils of acidic pH
or high in organic carbon content), solvent extraction conducted under
mild conditions (i.e. 40 °C) were not able to completely mobilize the
adsorbed test item. A certain fraction of unchanged test item was
released by 'aggravated' extraction only, conducted at 100 °C.
Log Koc values in the range of 1.28 - 2.95 were derived (overall mean
log Koc: 2.34).
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