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EC number: 205-438-8 | CAS number: 140-88-5
Adsorption / desorption
Administrative data
Link to relevant study record(s)
Description of key information
Adsorption of Ethyl acrylate to the solid soil phase is not expected. Ethyl acrylate is placed into a high to very high mobility class for adsorption and desorption to soils.
Koc = 42.2 ± 31.4
Key value for chemical safety assessment
- Koc at 20 °C:
- 42.2
Additional information
The adsorption and desorption characteristics of ethyl acrylate to five soils, a loamy sand, a clay loam, two loams and an aquatic sediment, were determined in a guideline study according to EPA guidelines - CFR 40 section 796.2750 and GLP regulations (BAMM 1991). The organic carbon content of the soils and sediment used ranged from 0.46 % to 4.58 %. 14C- Ethyl acrylate was used in following the movement of the compound for one adsorption and three desorption steps. Six concentrations of EA in 0.1 N calcium nitrate solution were used in these experiments. The concentrations of EA ranged from 0.9 to 9 µg/mL of the carrier solutions. The amount of EA in solution was measured by liquid scintillation counting. The amount of EA on the soil was calculated from differences in solution concentrations for the adsorption and first two desorptions. The amount on the soil after the third desorption was determined directly by combustion of the soil. Overall, replicate 14C balances ranged from 89.2 to 108.8 %.
EA was weakly adsorbed onto the soils and sediment. The average value for the adsorption isotherm constant was 0.58. As related to the carbon content of the individual soils, the average Koc for the adsorption step was 42.2 ± 31.4. This places EA in a high to very high mobility class for adsorption to soils.
Ethyl acrylate was less readily desorbed from the soils once adsorption had occurred. The average desorption isotherm constant for three desorptions was 1.24. Related to the carbon content of the individual soils, the average Koc for the combined desorption steps was 80.4 ± 57.1. This again places EA in a high to very high mobility class for desorption from soils.
These results are supported by QSAR calculations. Based on an estimated Koc of 11.85 calculated by SRC PCKOCWIN v1.66 (corrected log Koc = 1.07), adsorption to solid soil phase is not expected (BASF SE, 2008).
The potential for adsorption to soil, sediment, and suspended solids is low (BASF SE, 2008).
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