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EC number: 231-850-2
CAS number: 7759-02-6
One reliable acute toxicity data point (Klimisch 1, GLP) for a freshwater fish species -the carp Cyprinus carpio - has been identified. Based on measured Sr-level in the water column, a 96h-LC50 of >84.5 mg SrSO4/L (>40.3 mg Sr/L) is reported by Tobor-Kaplon (2010), using strontium nitrate as test substance.One reliable acute toxicity data point (Klimisch 2) for a saltwater fish species -morone saxatilits - has been identified. Based on measured Sr-level, an umbounded 96h-LC50 of >193.9 mg SrSO4/L (>92.5 mg Sr/L) is reported by Dwyer, F.J., et al. (1992), using strontium chloride hexahydrate as test substance.
In the aqueous
and terrestrial environment, strontium sulfate dissolves in (pore) water
releasing strontium cations and sulfate anions.
are of low environmental toxicity (OECD SIDS for Na2SO4)
as sulfate is essential to all living organisms and their intracellular
and extracellular concentrations are actively regulated.
No or few ecotoxicological data are available for strontium sulfate
itself. For the assessment of the environmental fate and behaviour of
strontium substances, a read-across approach is applied based on all
information available for inorganic strontium compounds. This is based
on the common assumption that after emission of metal compounds into the
environment, the moiety of toxicological concern is the potentially
bioavailable metal ion (i.e., Sr2+).This
assumption is considered valid as the ecotoxicity is only affected by
the strontium-ion and not by the counter (sulfate) ion.The
speciation and chemistry of strontium is rather simple.
electropositive metal, strontium is easily oxidized to the stable and
colourless Sr2+ion in most of its compounds, the chemical
behaviour resembling that of calcium and/or barium (Wennig and Kirsch,
1988). In the environment, the element only occurs in one valence state
(Sr2+), does not form strong organic or inorganic complexes
and is commonly present in solution as Sr2+(Lollar, 2005).
Consequently, the transport, fate, and toxicity of strontium in the
environment are largely controlled by solubility of different Sr-salts
(e. g., SrCO3, Sr(NO3)2, SrSO4,
are sufficient justification for the implementation of a read-across
strategy with ecotoxicity results obtained in tests that were conducted
with different strontium compounds that generate free Sr2+-ions
in solution, and this for all relevant environmental endpoints that were
In sum, the
environmental hazard assessment is based on strontium.
R.; Kirsch, N. (1988): Chapter 57 Strontium, In: Seiler, U. G. et al.(eds),
Handb. Tox. Inorg. Comp. NY, 631-638
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