Sulfate sulfur isotope analysis

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Method synopsis

Analysis of δ34S in dissolved sulfate from groundwater samples to identify sulfate reduction processes. Rayleigh fractionation modeling used to quantify biological sulfate reduction with fractionation factor α=1.030.

Synthesized from method descriptions across 1 paper using this protocol.

Procedure from a recent peer-reviewed implementation

Steps below were extracted from the most recent peer-reviewed implementation of this protocol in the corpus — Sulfur Biogeochemical Cycling and Redox Dynamics in a Shale-Dominated Mountainous Watershed (2022), Journal of Geophysical Research: Biogeosciences. Implementations in other papers (listed below) may differ.

1. Perform sulfur K-edge XANES analysis
   All samples were analyzed at sulfur K-edge by XANES at Canadian Light Source (CLS), Stanford Synchrotron Radiation Laboratory (SSRL), and Advanced Light Source (ALS). Spectra were recorded in fluorescence mode with absolute energy calibrated to 2481.8 eV using calcium sulfate white line.
   Quantities: 2 scans per sample at CLS, 14-19 scans per sample at SSRLDuration: Multiple beamtime allocationsConditions: Synchrotron radiation facilities with specific beamline configurations
   Equipment: CLS SXRMB beamline with 7-element silicon drift detector, SSRL beamline 14-3 with 4-element Vortex detector, ALS beamline 10.3.2 with 1-element silicon drift fluorescence detector

Typical Equipment

• isotope ratio mass spectrometer or similar isotopic analysis equipment

Output Measurements

• δ34S values
• sulfate reduction rates
• fractionation trends

Papers Using This Protocol (1)

Species Studied With This Protocol

Places Where Used