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Potential of activated carbon to decrease 2,4,6-trinitrotoluene toxicity and accelerate soil decontamination.

G K Vasilyeva1, V D Kreslavski, B T Oh

  • 1School of Natural Resource Sciences, University of Nebraska, Lincoln, Nebraska 68583-0758, USA.

Environmental Toxicology and Chemistry
|May 8, 2001
PubMed
Summary
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Activated carbon addition effectively reduces 2,4,6-trinitrotoluene (TNT) toxicity in contaminated soil. Combining activated carbon with corn plants significantly enhances bioremediation, reducing explosive residues by up to 91%.

Area of Science:

  • Environmental Science
  • Soil Science
  • Bioremediation

Background:

  • Explosives like 2,4,6-trinitrotoluene (TNT) pose significant environmental risks.
  • Highly contaminated soils require effective remediation strategies to mitigate toxicity to plants and microorganisms.

Purpose of the Study:

  • To investigate the efficacy of activated carbon in reducing TNT toxicity and promoting soil bioremediation.
  • To evaluate the combined effects of activated carbon and plant uptake on TNT transformation and binding.

Main Methods:

  • Activated carbon was added to TNT-contaminated soil at varying concentrations (0.25-1.0%).
  • TNT and its transformation products were monitored in soil solution and soil matrix.
  • Corn plants (Zea mays L.) were grown in amended soil, and plant material was incorporated to assess further bioremediation.

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Main Results:

  • Activated carbon significantly decreased TNT and its transformation product concentrations in soil solution, reducing toxicity.
  • Up to 50% of TNT was rapidly bound to the soil-activated carbon matrix, with further oxidation and reduction pathways observed.
  • Incorporating corn plants after 52 days of growth enhanced TNT and transformation product reduction by 91% within 120 days.

Conclusions:

  • Activated carbon is a promising amendment for decreasing TNT toxicity and facilitating soil bioremediation.
  • The combination of activated carbon and phytoremediation (plant uptake and incorporation) offers a synergistic approach for in situ remediation of explosive-contaminated soils.