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Environmental fate & pathways

Adsorption / desorption

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Description of key information

Adsorption to solid soil phase is not expected.

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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 also based on acrylic acid. 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.