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Determining Terminal Electron-Accepting Processes in Groundwater Systems

This study explores how water chemistry can reveal terminal electron-accepting processes in diverse groundwater systems by tracking H2 concentrations. Previous research lacked in identifying these key processes. The paper introduces a hierarchical framework for TEAP identification across various aquifers, highlighting the consistency of H2 concentrations as a reliable indicator. Overall, H2 concentrations provide valuable insights when combined with tracking electron acceptor consumption and final product production.

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Determining Terminal Electron-Accepting Processes in Groundwater Systems

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  1. Deducing the distribution of terminal electron-accepting processes (TEAPs) in hydrologically diverse groundwater systems Chappelle et al. (1995) Water Resources Research, Vol 31, No. 2

  2. Introduction • The Importance • The Problem • The Alternative

  3. I TEAPs It Real • The Basics • Water chem can determine TEAPs by • Tracking electron acceptor consumption • Tracking final product accumulation • Tracking intermediate product concentrations • Previous studies fail to TEAPs it real • Hydrogen (H2) concentrations an important intermediate product indicator of TEAPs

  4. PURPOSE OFTHEPAPER

  5. Hierarchical Framework for Identifying TEAPs

  6. STUDY SITES

  7. Black Creek Aquifer, South Carolina

  8. Black Creek Aquifer, South Carolina

  9. Floridan Aquifer - Baldosta, Georgia

  10. Floridan Aquifer - Baldosta, Georgia

  11. Alluvial-Lacustrine Aquifers – San Joaquin Valley

  12. Alluvial-Lacustrine AquifersSan Joaquin Valley

  13. Petroleum Hydrocarbon-Contaminated Aquifer: Hanahan, South Carolina

  14. Petroleum Hydrocarbon- Contaminated Aquifer: Hanahan, South Carolina

  15. CONCLUSIONS • The main, important observation is that H2concentration ranges for different TEAPs are consistent between the diverse hydrologic systems studied • H2 Concentrations are a useful indicator for TEAPs and increase confidence when used in conjunction with electron acceptor consumption and final product production.

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