Extended X-ray Absorption Fine Structure spectroscopy

Knowledge graph centered on Extended X-ray Absorption Fine Structure spectroscopy with 12 nodes and 23 connections. Top connected: Porewater Lead Concentrations Limited by Particula, drive-point piezometer groundwater sampling, porewater chemistry, iron speciation, redox gradients.

Method synopsis

X-ray absorption spectroscopy to determine lead coordination environments and speciation in soil samples. Uses linear combination fitting with reference standards to quantify different Pb phases.

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 — Porewater Lead Concentrations Limited by Particulate Organic Matter Coupled With Ephemeral Iron(III) and Sulfide Phases during Redox Cycles Within Contaminated Floodplain Soils (2021), Environmental Science & Technology. Implementations in other papers (listed below) may differ.

1. Perform EXAFS spectroscopy
   Lead L₃-edge extended X-ray absorption fine structure (EXAFS) spectra were collected at the Stanford Synchrotron Radiation Lightsource (SSRL) at beamlines 7-3, 9-3, and 11-2. Samples were ground to a fine paste and pressed into aluminum sample holders, which were sealed with Kapton tape. Samples were stored in an anaerobic chamber (95% N₂, 5% H₂ atmosphere) until transfer to a liquid helium cryostat at the beamline.
   Quantities: 3 beamlines used: 7-3, 9-3, and 11-2, 95% N₂, 5% H₂ atmosphereDuration: Collection of spectra for each sample and standardConditions: Anaerobic storage, liquid helium cryostat temperatures
   Equipment: Stanford Synchrotron Radiation Lightsource, aluminum sample holders, Kapton tape, liquid helium cryostat, anaerobic chamber

Typical Equipment

• Stanford Synchrotron Radiation Lightsource
• aluminum sample holders
• Kapton tape
• liquid helium cryostat
• anaerobic chamber

Output Measurements

• Pb speciation
• Pb-POM fractions
• Pb-HFO fractions
• PbS fractions

Papers Using This Protocol (1)