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| Determination of Sr Isotopic Ratio in Seawater by Extraction Chromatographic Separation - Thermal Ionization Mass Spectrometry Coupled Selective Specific Resin |
| Received:July 22, 2014 Revised:December 04, 2014 |
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| DOI：doi:10.3969/j.issn.2095-1035.2015.01.005 |
| KeyWord:Sr speicific resin, thermal ionization mass spectrometry, seawater |
| Author | Institution |
| WU Shuchao |
浙江省地质矿产研究所，杭州 |
| CAO Ban |
浙江省地质矿产研究所，杭州 |
| DONG Liming |
浙江省地质矿产研究所，杭州 |
| HU Yongping |
国土资源部粘土矿物重点实验室,杭州 |
| LOU Peiding |
浙江省第三地质大队测试中心，金华 |
| ZHENG Cunjiang |
浙江省地质矿产研究所，杭州 |
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| Abstract: |
| 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-1 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 87Sr/86Sr were determined to be 0.709168±0.000004 mg/L and 0.709158±0.000003 mg/L for sample no.1 and no.2, respectively. The preliminary results can be offered as a reference for weather tracing in the East Ocean of China, as well as the comparison data for the geochemical study of global oceans. |
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