Registration Dossier
Registration Dossier
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EC number: 270-296-6 | CAS number: 68424-35-1
Ecotoxicological Summary
Administrative data
Hazard for aquatic organisms
Hazard for air
Hazard for terrestrial organisms
Hazard for predators
Additional information
Read-across approach
In the assessment of the environmental fate and ecotoxicity of fatty acids, C9-13, neo, calcium salts, a read-across approach from data for C9-C13-neo fatty acids (CAS 68938-07-8; EC 273-114-3) is proposed, because i) upon release to the environment and dissolution in aqueous media, fatty acids, C9-13, neo, calcium salts will dissociate and only be available in their dissociated form, i.e. as calcium cation and the C9-C13-neo carboxylate anion and ii) toxicity is caused by the C9-C13-neo carboxylate anion.
Upon dissolution in water, it is indeed predicted that metal carboxylates dissociate completely into the metal cation and the organic anion at environmentally relevant conditions. No information is available on the stability constants of fatty acids, C9-13, neo, calcium salts, but predictions of stability of other calcium carboxylates (Ca valerate, Ca isovalerate and Ca propionate) in a standard ISO 6341 medium (2 mM CaCl2, 0.5 mM MgSO4, 0.77 mM NaHCO3 and 0.077 mM KCl, pH 6 and 8) clearly show that carboxylic acids have no potential for complexing calcium ions in solution (Visual minteq. Version 3.0, update of 18 October 2012. http://www2.lwr.kth.se/English/OurSoftware/vminteq/index.html).
Calcium is abundantly present in natural environments (Table 1 of endpoint summary IUCLID section 5), and emissions of fatty acids, C9-13, neo, calcium salts are not expected to significantly increase the exposure concentration for calcium in water, sediment and soil. Moreover, calcium is a major essential element for living organisms and therefore it is not considered as critical for the environmental effects assessment of fatty acids, C9-13, neo, calcium salts.
Only few ecotoxicity data are available for fatty acids, C9-13-neo or its salts. Based on the similarities in structure, physical-chemical properties, environmental fate and toxicity between fatty acids C9-13-neo and neodecanoic acid (C10-neo acid; CAS 26896-20-8), data for neodecanoic acid were therefore selected for the read-across approach. This is consistent with the grouping approach followed by the US EPA HPV programme for even a wider range of neo acids (C5 -C28; http://www.epa.gov/hpvis/rbp/Category_Neoacids%20C5-28_Web_April%202009.pdf).
Conclusion on classification
The substance fatty acids, C9-13, neo, calcium salts will completely dissociate into calcium and fatty acids, C9-13-neo- ions after dissolution in water and hence can be regarded as a mixture of both constituent ions. In the absence of toxicity data for fatty acids, C9-13, neo, calcium salts itself, its classification for environmental hazards is therefore based on the classification of its moieties (Ca and fatty acids, C9-13-neo-). Calcium is not classified as hazardous to the aquatic environment, while fatty acids, C9-13-neo are classified as aquatic chronic 3. Taking into the composition of fatty acids, C9-13-neo-, calcium salts and the summation method rules, it is concluded that fatty acids, C9-13-neo-, calcium salts are classified as chronic 3 for hazards to the aquatic environment.
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