Strontium and water: reaction mechanisms, environmental impact and health effects

Seawater contains 8 ppm strontium on average. River water generally contains about 50 ppb of strontium and in oyster tissue 10 ppm of strontium (dry mass) was found.
When dissolved in water strontium mainly occurs as Sr²⁺ (aq). One other possible form is SrOH⁺ (aq).