Registration Dossier
Registration Dossier
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EC number: 939-424-4 | CAS number: 1469983-44-5
Endpoint summary
Administrative data
Description of key information
Additional information
Substance characterisation with respect to environmental fate and behavior
The test substance Diacid 1550 is a UVCB, the reaction product of unsaturated tall oil fatty acids with acrylic acid. The major group of constituents consists of monocyclic C21-dicarboxylic acid isomers bearing saturated alkyl chains and a cyclic branch (84%). The remainder consists of a minor fraction of similar C23-dicarboxylic acid isomers (0.5%), unreacted C18-monoacids (10% - natural fatty acids) and an unknown fraction (5%).The composition with the branched diacid isomers that are structurally related represents a relatively homogenous type and the environmental risk assessment may be based on the properties of the main group of constituents, the C21-dicarboxylic acid composed of saturated alkyl chains and a cyclohexene branch (82.5%). The fatty acids fraction will have different properties for water solubility, volatility, adsorption and lipophility that determine their environmental behaviour. In view of the lower fraction, these constituents will not significantly contribute to the environmental exposure.
The water solubility of the major fraction of dicarboxylic acids is 16 mg/l at 20ºC and pH 7. The water solubility of the 10% unreacted C18-fatty acids is below 1.3 mg/l. Log Kow of the total composition ranged between 3.4 and 7.6 at 30ºC and pH 7. Log Kow ranges between 6.4 and 6.6 for the main fraction (73.4% of the composition during the test). Thus the main constituents are expected to sorb onto organic matter, although at environmental pH Diacid 1550 behaves as an ionic compound. With a Vapour pressure far below 1 Pa, the substance will not partition to air.
Diacid 1550 was shown to be readily biodegradable. Therefore further testing of the biodegradability in water, sediment and soil as well as testing of the hydrolysis and adsorption/desorption have not been performed.
Although log Kow is high, the BCF predicted by EPISuite is 56 l/kg ww. This is reasonable as Diacid 1550 is readily biodegradable and it is likely that the main constituents of Diacid 1550 will also be biotransformed in higher organisms. As Diacid 1550 is a UVCB, the analytics in a bioaccumulation test would be complex and a waiver is requested for this test as no significant bioaccumulation is expected.
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