Registration Dossier
Registration Dossier
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EC number: 231-209-7 | CAS number: 7446-81-3
Adsorption / desorption
Administrative data
Link to relevant study record(s)
Description of key information
Adsorption to soil is not expected.
Key value for chemical safety assessment
- Koc at 20 °C:
- 42.8
Additional information
In water sodium acrylate will dissociate immediately into sodium- and acrylate-ions. Therefore, the estimation of the adsorptive properties of sodium acrylate is based on a weight of evidence approach consisting of experimental studies with acrylic acid and QSAR caculations with sodium acrylate. For detailed information see the attached WoE justification in chapter 13.2.
The adsorption and desorption characteristics of acrylic acid to five soils, a loamy sand, a clay loam, two loams and an aquatic sediment, were determined in a GLP guideline study (U.S. EPA guidelines - CFR 40 section 796.2750; BAMM 1991). The organic carbon content of the soils and sediment used ranged from 0.46 % to 4.58 %. 14C-acrylic acid was used in following the movement of the compound for one adsorption and three desorption steps. Six concentrations of acrylic acid in 0.1 N calcium nitrate solution were used in these experiments (0.3 - 9.9 µg/mL). The average Koc for the adsorption was 42.8 ± 53.98 (log Koc 1.63). Acrylic acid was less readily desorbed from the soils once adsorption had occurred. Related to the carbon content of the individual soils, the average Koc for the combined desorption steps was 183.1 ± 266.0. Based on acrylic acid it can be concluded that adsorption to solid soil phase of sodium acrylate is not to be expected.
These expectations were confirmed by QSAR calculations (EPIwin v4.11, KocWin v.2.00) with sodium acrylate. Due to its low log Kow the substance is not falling completely into the applicability domain of the submodel. But the estimated Koc was within the range of the measured Koc of acrylic acid. The results can therefore be considered reliable and no adsorption to the soild soil phase is expected.
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