High Precision Measurements of 32S, 33S, and 34S Isotopic Composition by Multiple Collector Inductively Coupled Plasma Mass Spectrometry.
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2014-05-22
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Abstract
A reliable method was developed for sulfur isotopic composition measurements of sulfur solutions (10 ppm) using a 20 mL cyclonic quartz spray chamber and 50 μL/min (Glass Expansion Inc.) quartz nebulizer coupled to a high mass resolution Multiple Collector Inductively Coupled Plasma Mass Spectrometry (MC-ICP-MS). The repeatability of the method was tested which three reference materials (IAEA S-1, IAEA S-2, and IAEA S-3) and the ability to measure sulfur isotopic variations in hair sample was evaluated. The n(34S)/n(32S) and n(33S)/n(32S) isotope amount ratios were measured free from isobaric interferences (e.g. 16O2+ on 32S+ and 32S1H+ on 33S+) and corrected for instrumental mass bias adopting the standard-sample bracketing approach. The reproducibility of IAEA S-2 and IAEA S-3 is typically ± 0.19 ‰ and ±0.52 (2sd) for δ34S and δ33S, respectively and ± 0.30 ‰ and ± 0.53 ‰ (2sd) for δ34S and δ33S, respectively. Freedom from isobaric interferences was verified by plotting δ34S vs. δ33S. Cleanliness of the spray chamber was found to be extremely important to achieve reliable data. A microwave digestion method was developed to analyze sulfur in hair samples. The reproducibility of hair samples was typically ± 0.45 ‰ and ± 0.75 ‰ (2sd) for δ34S and δ33S values, respectively. Achieving a reliable method for δ34S and δ33S measurements will enable now a high precision measurement of sulfur isotopic composition.
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Alfayfi, Y. (2014). High Precision Measurements of 32S, 33S, and 34S Isotopic Composition by Multiple Collector Inductively Coupled Plasma Mass Spectrometry. (Master's thesis, University of Calgary, Calgary, Canada). Retrieved from https://prism.ucalgary.ca. doi:10.11575/PRISM/26360