Registration Dossier
Registration Dossier
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EC number: 293-048-9 | CAS number: 91051-00-2
Endpoint summary
Administrative data
Description of key information
Based on read-across of zinc bioaccumulation data and the fact that fatty acids, C8-10 are readily biodegradable, bioaccumulation and biomagnification are not expected to be relevant for substance Fatty acids, C8-10, zinc salts. For a comprehensive overview of the bioaccumulation of zinc or the lack thereof, see the hazard assessment of "Zinc" within the framework of Regulation (EC) No 1907/2006 cited in excerpts below.
These conclusions are similar to the conclusions for a structural analogue from the EU RAR Zinc distearate (CAS-No.: 557-05-1 & 91051-01-3 EINECS-No.: 209-151-9 & 293-049-4) Part 1 - Environment (Final report R074_0805_env, May 2008 (http://echa.europa.eu/documents/10162/08799aec-42c5-44e0-9969-baa022c66db1):"Based on data on bioaccumulation of zinc in animals and on biomagnification (i.e. accumulation and transfer through the food chain), secondary poisoning is considered to be not relevant in the effect assessment of zinc..." "Distearate is not expected to bioaccumulate, knowing that fatty acids will degrade by the β oxidation pathway."
FATTY ACIDS, C8-10:
As fatty acids represent a significant part of the normal daily diet of higher tier organisms e.g. fish and also rapidly degraded by microorganisms, they are not expected to bioaccumulate.
ZINC:
Due to homeostatic control mechanisms, bioaccumulation is not relevant to essential elements in general and to like zinc in particular.
In experimental work, high BCF factors are observed at the lowest zinc exposure levels, due to the fact that organisms will concentrate zinc to satisfy internal physiological needs for the essential element. For the same reason of homeostasis, the BCF will strongly decrease when exposure concentrations increase. This results in a general negative relationship between BCF and exposure (McGeer et al 2003).
On bioaccumulation, the EU risk assessment report (ECB 2008) concludes that “it is concluded that secondary poisoning is considered to be not relevant in the effect assessment of zinc. Major decision points for this conclusion are the following. The accumulation of zinc, an essential element, is regulated in animals of several taxonomic groups, for example in molluscs, crustaceans, fish and mammals. In mammals, one of the two target species for secondary poisoning, both the absorption of zinc from the diet and the excretion of zinc, are regulated. This allows mammals, within certain limits, to maintain their total body zinc level (whole body homeostasis) and to maintain physiologically required levels of zinc in their various tissues, both at low and high dietary zinc intakes. The results of field studies, in which relatively small differences were found in the zinc levels of small mammals from control and polluted sites, are in accordance with the homeostatic mechanism. These data indicate that the bioaccumulation potential of zinc in both herbivorous and carnivorous mammals will be low."
References:
McGeer et al (2003). McGeer J, Brix KV, Skeaff JM, De Forest DK, Bingham SI, Adams WJ and Green A (2003). Inverse relationship between bioconcentration factors and exposure concentration of metals: implications for hazard assessment of metals in the aquatic environment. Env. Tox. & Chem. 22, nr 5, 1017-1037.
ECB (2008) European Communities, European Union Risk Assessment Report CAS: 7440-66-6 EINECS No: 231-175-3 ZINC METAL, EUR 24587 EN, available at http://echa.europa.eu/documents/10162/08799aec-42c5-44e0-9969-baa022c66db1
Additional information
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