My Account: Log In | Join | Renew
Search
Author
Title
Vol.
Issue
Year
1st Page

Abstract

 

This article in JEQ

  1. Vol. 29 No. 3, p. 768-777
     
    Received: June 21, 1999
    Published: May, 2000


    * Corresponding author(s): mwi.schmidt@uni-koeln.de
 View
 Download
 Alerts
 Permissions
 Share

doi:10.2134/jeq2000.00472425002900030012x

Airborne Contamination of Forest Soils by Carbonaceous Particles from Industrial Coal Processing

  1. Michael W. I. Schmidt *,
  2. Heike Knicker,
  3. Patrick G. Hatcher and
  4. Ingrid Kögel-Knabner
  1. Dep. of Soil Science, Technische Universität München, D-85350 Freising-Weihenstephan, Germany;
    Dep. of Chemistry, Ohio State Univ., 100 West 18th Ave., Columbus OH 43210.

Abstract

Abstract

In the German Ruhr-area industrial coal processing emitted large amounts of carbonaceous particles for a century until 1970. Our objectives were to detect the presence of airborne carbonaceous particles and assess their impact on the chemical structure of soil organic matter in two forest soils (Podzols) with potential sources of carbonaceous particles approximately 10 to 30 km away. Contamination was not visible macroscopicaily. Organic matter was characterized in bulk soils and in particle-size separates by elemental analysis, magnetic susceptibility measurement, reflected light microscopy, and 13C solid-state nuclear magnetic resonance (NMR) spectroscopy. Organic and mineral horizons contained carbonaceous particles including char, coke, and bituminous coal from coal combustion, coking, coal processing, and steel production. In the organic horizons of both soils we observed a material high in magnetic susceptibility (max. 109 × 10−8 m3 kg−1), whereas in the mineral horizons only the Podzol with an intense intermixing moder-type humus had high magnetic susceptibly. This Aeh horizon was extremely rich in organic carbon (139.4 g organic C kg−1), concentrated in the 20 to 2000 µm size separates. In the second Podzol, like in many natural soils, C concentrations were largest in the <20 µm separates. Bloch decay 13C magic angle spinning (MAS) NMR spectroscopy revealed a highly aromatic structure of the carbonaceous particles. Airborne carbonaceous particles formed a macroscopically indistinguishable mixture with natural soil organic matter and could be present in many soils neighboring industrialized areas.

  Please view the pdf by using the Full Text (PDF) link under 'View' to the left.

Copyright © .