Separation and Isotopic Measurement of Sr in Tooth Samples Using Selective Specific Resins

Strontium isotope of ancient human teeth provides an important scientific basis for ancient population migration,and Palaeodietary analysis.A fast and effective method for separation,preconcentration and isotopic determination of strontium with low content and rich calcium of tooth samples by Sr-Spec selective specific resin was established.The samples were completed dissolved with mixed acid of HNO3-HClO4.Sr was increasingly well retained by Sr resin for mobile phases with nitric acid concentrations of 8 mol/L,However,potential interferences,like Ca,Rb will elute within the 8 mol/L nitric acid.Once adsorped,Sr can be eluted from the column by changing the mobile phase to weak nitric acid of 0.05 mol/L.In comparison with the conventional separation procedures,the method has the advantages of fewer steps of separation,less usage of elution solutions and lower reagent blanks.The proposed method was used for the determination of 10 none carious teeth of enamel collected in southern of shaanxi.Giving values of 87Sr/86Sr were in the range of 0.710948～0.711037.