Journal
JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY
Volume 37, Issue 1, Pages 194-202Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1ja00340b
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Funding
- Agencia Estatal de Investigacion, Madrid, Spain [PGC2018-097961-B-100]
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A reliable method for measuring the Sr-87/Sr-86 ratio in carbonates without off-line strontium separation was developed and validated. The results were in agreement with expected values, making it suitable for geological studies.
A procedure for the measurement of Sr-87/Sr-86 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.
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