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Related Experiment Videos

Gas forming processes within lignite mining dumps.

H M Nitzsche1, W Glässer, P Harting

  • 1Institut für Nichtklassische Chemie e. V. an der Universität Leipzig, Permoserstrasse 15, 04318 Leipzig, Germany. nitzsche@inc.uni-leipzig.de

Isotopes in Environmental and Health Studies
|May 3, 2003
PubMed
Summary

Lignite mining dumps release carbon dioxide from both humous organic matter and marine carbonates. Isotope analysis reveals these distinct sources and their contribution to gas emissions without increasing internal pressure.

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Area of Science:

  • Geochemistry
  • Environmental Science
  • Soil Science

Background:

  • Lignite mining dumps can release significant amounts of carbon dioxide into the atmosphere.
  • Understanding the sources and mechanisms of carbon dioxide release is crucial for environmental management.

Purpose of the Study:

  • To investigate the sources and carbon dioxide releasing capacity of lignite mining dumps.
  • To determine the origin of carbon dioxide using isotopic analysis of soil atmosphere and dump material.

Main Methods:

  • Gas analysis of soil atmosphere.
  • Determination of organic and inorganic carbon content.
  • Isotopic composition analysis (δ¹³C) of organic carbon, inorganic carbon (carbonates), and soil carbon dioxide.

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Main Results:

  • Increased carbon dioxide content was detected in the soil atmosphere of lignite mining dumps.
  • Organic carbon isotopic composition (-24.5 to -26.5‰) indicates humous material origin.
  • Carbonate isotopic composition (+0.5 to -1.1‰) suggests marine origin.
  • Isotope investigations confirmed both humous organic matter and marine carbonates as sources of carbon dioxide.
  • Mixing ratios of carbon dioxide sources were calculated using isotope balance equations.

Conclusions:

  • Carbon dioxide in lignite mining dumps originates from both the decomposition of organic matter and the dissolution/weathering of marine carbonates.
  • These processes consume oxygen but do not lead to increased gas pressure within the dumps.
  • Isotopic fingerprinting is an effective method for identifying carbon sources in mining environments.