|Title:||Improved analytical techniques of sulfur isotopic composition in nanomole quantities by MC-ICP-MS||Authors:||Yu, T.-L.
|Issue Date:||2017||Journal Volume:||988||Start page/Pages:||34-40||Source:||Analytica Chimica Acta||Abstract:||
We propose an improved method for precise sulfur isotopic measurements by multi-collector inductively coupled plasma mass spectrometry (MC-ICP-MS) in conjunction with a membrane desolvation nebulization system. The problems of sulfur loss through the membrane desolvation apparatus are carefully quantified and resolved. The method overcomes low intrinsic sulfur transmission through the instrument, which was initially 1% when operating at a desolvation temperature of 160 °C. Sulfur loss through the membrane desolvation apparatus was resolved by doping with sodium. A Na/S ratio of 2 mol mol−1 produced sulfur transmissions with 98% recovery. Samples of 3 nmol (100 ng) sulfur achieved an external precision of ±0.18‰ (2 SD) for δ34S and ±0.10‰ (2 SD) for Δ33S (uppercase delta expresses the extent of mass-independent isotopic fractionation). Measurements made on certified reference materials and in-house standards demonstrate analytical accuracy and reproducibility. We applied the method to examine microbial-induced sulfur transformation in marine sediment pore waters from the sulfate-methane transition zone. The technique is quite versatile, and can be applied to a range of materials, including natural waters and minerals. © 2017 Elsevier B.V.
|URI:||https://scholars.lib.ntu.edu.tw/handle/123456789/493002||DOI:||10.1016/j.aca.2017.08.012||SDG/Keyword:||Inductively coupled plasma mass spectrometry; Isotopes; Mass spectrometers; Mass spectrometry; Sodium; Submarine geology; Certified reference materials; Desolvation; Desolvation nebulization; Mass-independent isotopic fractionations; MC-ICP-MS; Multi-collector inductively coupled plasma mass spectrometry; Sulfate-methane transitions; Sulfur isotope; Sulfur; methane; sodium; sulfur; water; Article; evaporation; fractionation; isotope analysis; mass spectrometry; measurement accuracy; priority journal; quality control; quantitative analysis; reproducibility; sediment; sensitivity analysis; temperature
|Appears in Collections:||地質科學系|
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