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EC number: 231-850-2
CAS number: 7759-02-6
In the aqueous
and terrestrial environment, strontium sulfate dissolves in (pore) water
releasing strontium cations and sulfate anions. Sulfate is essential to
all living organisms, their intracellular and extracellular
concentrations are actively regulated and thus, sulfates are of low
toxicity to the environment (OECD SIDS for Na2SO4). Thus, the strontium
cation is the moiety of toxicological concern (if any), and the
environmental hazard assessment is based on strontium.
Data that were retrieved, suggest that
strontium bioconcentration and bioaccumulation is negligible: internal
concentrations of soft tissues remain situated between 0.5 and 5.7 μg/g,
regardless of the external concentration (9 – 8000 μg/L). Whole body
concentrations were considered less relevant due to the potential of
strontium to replace Ca in the bones. Reported tissue BAFs vary more
than 2 orders of magnitude, but remain below 100. Moreover, an inverse
relationship between exposure concentration and BAF has been observed,
i. e., decreasing BAFs with increasing Sr-levels in the water column
(Moiseenko and Kudryavtseva, 2001).
The data indicate that strontium can
is homeostatically controlled by aquatic organisms. The homeostatic
control in soft tissues of strontium is observed to continue to function
up to the milligramme range of exposure (8 mg/L in seawater; Ueda et al,
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