中文摘要：

采用锶特效树脂,以萃取色谱法将锶离子自基体中分离,详细介绍了锶特效树脂萃取原理,进行了实验条件优化.采用HNO3消解海水样品,以HNO3 （8.0 mol/L）为介质上柱,用HNO3 （8.0 mol/L）淋洗,样品中的锶离子被强烈吸附在树脂柱上,再以HNO3 （0.05 mol/L）洗脱,Sr被解吸.收集淋洗液,蒸干,采用热电离同位素质谱仪测定海水样品中的87Sr/86Sr比值.结果表明,利用锶特效树脂,可将锶与基体元素（K,Na,Mg,Ba）分离,并能有效分离同位素测定中干扰元素Ca和Rb.消除了基体干扰,提高了分离效率,达到灵敏测定.

英文摘要：

The current study describes an isotopic determination of Sr in seawater with thermal ionization mass spectrometry （TIMS）. An extraction chromatographic column packing with specific selective resin was utilized for purifying Sr from associate matrix ions （Na, K, Ca, Mg, Ba and Rb）. Optimal conditions for eluting behavior of Sr were performed. Eluted by 8.0 mol/L HNO3, Sr was strongly retained on the column while matrix ions flushing out of the column immediately. The adsorbed Sr ions could then be stripped from the column as the eluent＇s concentration was changed to 0. 05 mol/L. The Sr ions eluted from the column were collected for the subsequent isotopic measurement. Under the optimal operation conditions, the values of 87 Sr/86 Sr were for sample no. 1 and no. 2, respectively. tracing in the East Ocean of China, as oceans. determined to be （0. 709 168±0. 000 004）and（0. 709 158±0. 000 003） The preliminary results can be offered as a reference for weather well as the comparison data for the geochemical study of global