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Post Column Derivatization Using Reaction Flow High Performance Liquid Chromatography Columns
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Hydrogen peroxide stabilization in one-dimensional flow columns.

Jeremy T Schmidt1, Mushtaque Ahmad, Amy L Teel

  • 1Department of Civil and Environmental Engineering, Washington State University, Pullman, WA 99164-2910, United States.

Journal of Contaminant Hydrology
|June 25, 2011
PubMed
Summary
This summary is machine-generated.

Phytate effectively stabilizes hydrogen peroxide in iron oxide-coated sands, enhancing catalyzed hydrogen peroxide (CHP) in situ chemical oxidation (ISCO) remediation. Citrate and phytate also stabilize hydrogen peroxide in manganese oxide-coated sands.

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Area of Science:

  • Environmental Science
  • Geochemistry
  • Chemical Engineering

Background:

  • Rapid decomposition of hydrogen peroxide limits the effectiveness of catalyzed hydrogen peroxide (CHP) for in situ chemical oxidation (ISCO) subsurface remediation.
  • Stabilizing hydrogen peroxide is crucial for extending its reactive lifetime and increasing the radius of influence in ISCO applications.

Purpose of the Study:

  • To investigate the efficacy of citrate and phytate as stabilizers for hydrogen peroxide in the context of CHP ISCO.
  • To evaluate the performance of these stabilizers in different subsurface conditions, specifically iron oxide-coated and manganese oxide-coated sands.

Main Methods:

  • One-dimensional sand columns coated with iron oxide and manganese oxide were used to simulate subsurface conditions.
  • Hydrogen peroxide solutions, with and without citrate or phytate (25 mM), were applied to the columns.
  • Samples were collected from multiple ports along the columns to measure hydrogen peroxide residuals and stabilizer behavior.

Main Results:

  • Phytate significantly enhanced hydrogen peroxide residuals in iron oxide-coated sand (two orders of magnitude increase).
  • Both citrate and phytate effectively stabilized hydrogen peroxide in manganese oxide-coated sand (four-fold increase).
  • Stabilizers did not degrade or show retardation, and they increased column flow rates, indicating improved performance.

Conclusions:

  • Citrate and phytate are effective stabilizers for hydrogen peroxide in dynamic column conditions relevant to CHP ISCO.
  • Pre-adding citrate or phytate to hydrogen peroxide before subsurface injection can improve the radius of influence for ISCO remediation.
  • These findings offer a practical strategy to enhance the efficiency of subsurface remediation using catalyzed hydrogen peroxide.