Measurement of 87 Sr/ 86 Sr in limestones after acid leaching and direct injection in a liquid chromatograph coupled to a multicollector ICP-MS
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5 janvier 2022
- handle: 10670/1.ouy0iy
- halshs: halshs-03513240
- doi: 10.1039/D1JA00340B
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info:eu-repo/semantics/altIdentifier/doi/10.1039/D1JA00340B
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B. Puente-Berdasco et al., « Measurement of 87 Sr/ 86 Sr in limestones after acid leaching and direct injection in a liquid chromatograph coupled to a multicollector ICP-MS », HAL-SHS : géographie, ID : 10.1039/D1JA00340B
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Résumé
A procedure for the measurement of 87Sr/86Sr in carbonates without off-line strontium separation was developed, validated and applied to Normandy chalkstones. The method is based on the injection of the dissolved/leached sample into a high-performance liquid chromatography (HPLC) system directly coupled to a multicollector inductively coupled plasma mass spectrometer (MC-ICP-MS). Matrix and spectral (Ca, Rb) interferences were removed by an on-line separation procedure based on cation exchange chromatography using 1 M nitric acid as an eluent in the presence of 3.8 mM 18-crown-6. The main polyatomic interferent was identified as NO2Ca+, affecting mass 86 of strontium. Isotope ratios were calculated by multiple linear regression from the measured chromatographic peaks. The method was evaluated using a NIST 987 Sr isotope reference material and subsequently validated employing a JCp-1 coral reference material in comparison with the traditional off-line separation procedure. Finally, the method was applied to ten Normandy limestones (chalkstones) with results in agreement with the expected values based on geological, geochemical, and stratigraphic studies