Adsorption and removal of strontium in aqueous solution by synthetic hydroxyapatite

Hydroxyapatite (HAP) is a main mineral constituent of bone and tooth and has an outstanding biocompatibility. HAP is a possible sorbent for heavy metals in wastewater due to its high adsorption capacity and low water solubility. We developed a removal system of ⁹⁰Sr from aqueous solution by HAP column procedure. More than 90 % of ⁹⁰Sr was adsorbed and removed from the ⁹⁰Sr containing solution. Divalent cations, Ca²⁺, had little effect on the removal of ⁹⁰Sr up to a concentration of 1 mmol L^-1. This clearly indicates that the HAP column technique is advantageous with respect to the capacity to adsorb ⁹⁰Sr from water present in the environment.