Registration Dossier
Registration Dossier
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EC number: 231-209-7 | CAS number: 7446-81-3
Endpoint summary
Administrative data
Description of key information
Sodium acrylate can be considered stable regarding phototransformation and hydrolysis.
Additional information
There are no experimental data on photodegradation in air of sodium acrylate. Therefore, QSAR calculations with EPIWin v4.11 AOP v1.92 were conducted. Both calculations showed that sodium acrylate and the structural analogue acrylic acid will be rather slowly degraded by photochemical processes after exposure to the air reacting with the photochemically produced hydroxyl radicals. In addition, since sodium acrylate shows a very low vapour pressure (0.000000515 at 25 °C), a significant evaporation is unlikely. Consequently, photodegradation of sodium acrylate under environmental conditions is not of major concern.
Based on the structural similarity and dissociation behavior of sodium acrylate in aqueous environment (Henderson-Hasselbach calculation), data from a reliable experimental study with acrylic acid was used to access the hydrolysis potential of sodium acrylate. Due to the pH dependency of the reaction shift toward AA (at low pH values), the data for acrylic picture the worst-case scenario.
The rate and route of hydrolysis of radiolabeled (14C) acrylic acid was determined at pH 3, 7 and 11 in accordance to Environmental Protection Agency Guidelines, 40 CUR Part 796.3500 over 28 d in a buffered solution (BAMM, 1990; REACH Dossier). The study was conducted under light exclusion to prevent photodegradation processes. The samples were taken as triplicates and measured via HPLC. No rate constants or half-life could be calculated since AA was stable at all measured pH-values. The study was conducted in compliance with GLP regulations and was classified as highly reliable (Klimisch score1). Therefore, hydrolysis will not contribute to abiotic degradation of acrylic acid or sodium acrylate.
Sodium acrylate can be considered stable regarding phototransformation and hydrolysis.
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