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Speciation diagrams were calculated for LF-4 site along the Fountain Creek in the stream water with concentrations (A) of [Se(IV)] 1.2 × 10−8 M, [Se(VI)] 1.1 × 10−7 M and [Ca]tot 1.7 × 10−3 M and (B) [Se(IV)] 1.2 × 10−8 M, [Se(VI)] 1.1 × 10−7 M and [Mg]tot 9.4 × 10−4 M.
