A Unified Method for Triple Oxygen Isotope Analysis of Sulfate, Water, and Organics
Fabian Zahnow, Dingsu Feng, Andreas Pack, David Bajnai, Daniel Herwartz
TL;DR
A new automated method called TORCH enables accurate triple oxygen isotope analysis of sulfate, water, and organic materials using a unified approach.
Contribution
The TORCH method unifies triple oxygen isotope analysis across different materials with high precision and direct reference scaling.
Findings
The TORCH method achieves reproducibility of ±14 per meg for Δ′17O and ±0.3‰ for δ18O.
Consistent triple oxygen isotope values are obtained across different sample types and techniques.
Quantitative oxygen extraction and accurate scaling are essential for reliable isotope analysis.
Abstract
Triple oxygen isotope analyses of sulfate, water, and organic materials provide vital insights into geochemical processes. Here, we present the fully automated TORCH method (Triple Oxygen isotope analysis using Reduction, Conversion, and High-precision laser spectroscopy), which enables the direct normalization of various materials to the VSMOW-SLAP reference scale using a unified method. The method integrates high-temperature thermal conversion elemental analysis (TC/EA), high-voltage glow discharge CO-to-CO2 conversion, and tunable infrared laser direct absorption spectrometry for simultaneous δ18O and Δ′17O determination from CO2. We applied the TORCH method to international and in-house standards of Barite (IAEA-SO-5, IAEA-SO-6), benzoic acid (IAEA-601), cellulose (Sigma-Aldrich 0742213, labeled Cellulose-KOSI), and water (VSMOW2, SLAP2, USGS46), demonstrating quantitative oxygen…
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Taxonomy
TopicsGroundwater and Isotope Geochemistry · Mine drainage and remediation techniques · Geochemistry and Geologic Mapping