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Environ Pollut. 2012 Mar;162:151-8. doi: 10.1016/j.envpol.2011.10.036. Epub 2011 Dec 8.

Chromate removal as influenced by the structural changes of soil components upon carbonization at different temperatures.

Author information

1
Department of Soil & Environmental Sciences, National Chung Hsing University, Taichung, Taiwan, ROC.

Abstract

Surface fire could induce heat transferring into the soil, creating a carbonized environment, which may alter the chemical compositions of soil organic matters (SOM). In the study, a surface soil was carbonized at up to 600 °C with limited air to simulate soils experiencing a surface fire, and Cr(VI) removal on the carbonized soils was investigated. NMR and FTIR analyses demonstrated a remarkable change of SOM structures at 300-400 °C. TGA-MS spectra indicated that (e.g. C(2)H(4), CH(3)OH and C(3)H(8)) were the major components in the evolved gases from the pyrolyzed soil. A maximum amount of Cr(VI) removal (ca. 4 mg g(-1) soil) occurred for the 200 °C-carbonized soils, attributed mainly to a significant increase of Cr(VI) reduction by 0.1 M KCl extractable organic carbon (EOC) with abundant carboxylic groups. Nonetheless, the formation of aromatic C upon carbonization of the soil at >400 °C may be responsible for Cr(VI) reduction.

PMID:
22243860
DOI:
10.1016/j.envpol.2011.10.036
[Indexed for MEDLINE]

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