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Environmental fate & pathways

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SrS will not occur as such in the environment. In the aqueous and terrestrial environment, strontium sulfide dissolves in water releasing strontium cations and sulfide anions.

Sulfide:Food chain bioconcentration and biomagnification of sulfide are unlikely(ATSDR 2006). Seven reliable studies were identified on bioconcentration and bioaccumulation of sulfide in marine invertebrates. Reliable data on fish or algae are not available. The highest wet-weight based BCF of 1.6 L/kg ww indicates that sulfides do not have a potential for bioconcentration/bioaccumulation.

Strontium:Data that were retrieved, suggest that strontium bioconcentration and bioaccumulation is negligible: internal concentrations of soft tissues remain situated between 0.5 and 5.7μg/g, regardless of the external concentration (9 – 8000μg/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 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, 1973).

Limited information on transfer of strontium through the food chain indicates that strontium does not biomagnify in aquatic food chains.

Data on the bioaccumulation of strontium and sulfide in soil organisms have not been identified. The evaluation of the bioaccumulative potential of strontium and sulfide in the aquatic system, however, seems to suggest that strontium and sulfide are also not largely accumulated by terrestrial organisms