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Environmental fate & pathways

Bioaccumulation: aquatic / sediment

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Metal carboxylates are substances consisting of a metal and a carboxylic acid. Based on the solubility of strontium neodecanoate in water (8.47 g dissolved Sr/L at pH 8.4 corresponding to 45.07 g strontium neodecanoate/L), a complete dissociation of strontium neodecanoate resulting in strontium and neodecanoate ions may be assumed under environmental conditions.

 A bioconcentration study with neo-decanoic acid (CAS #26896 -20 -8) was conducted with the rainbow trout, Oncorhynchus mykiss. The calculated mean bioconcentration factor (BCF) after 14 days of exposure was <225 L/kg wet fish weight, based on the detection limit for neodecanoic acid. Therefore, based on the BCF data, neodecanoic acid is expected to exhibit a low potential to bioaccumulate in aquatic ecosystems. Regarding the potential of strontium to bioaccumulate in aquatic/terrestrial species, a variety of studies highlighted the similar behaviour of Sr and Ca ions, and Sr was shown to enrich in bones and rather hard tissues of organisms (ATSDR, Public Health Statement: Strontium; 2004). Respectively higher BCFs were determined in hard tissue of fish and invertebrates compared to BCFs of soft tissues. However, BCFs of hard tissues of freshwater organisms are relatively low and even lower for saltwater species. Therefore, it can be considered that strontium has a low potential to bioconcentrate or bioaccumulate in aquatic organisms.

Therefore, based on available data for strontium and neodecanoate, strontium neodecanoate is expected to have a low potential to bioaccumulate in aquatic and terrestrial organisms.

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