title: Chromate removal as influenced by the structural changes of soil components upon carbonization at different temperatures.
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.
authors.affiliation: Department of Soil & Environmental Sciences, National Chung Hsing University, Taichung, Taiwan, ROC.
authors.forename: K Y
authors.initials: KY
authors.lastname: Chen
authors.forename: J C
authors.initials: JC
authors.lastname: Liu
authors.forename: P N
authors.initials: PN
authors.lastname: Chiang
authors.forename: S L
authors.initials: SL
authors.lastname: Wang
authors.forename: W H
authors.initials: WH
authors.lastname: Kuan
authors.forename: Y M
authors.initials: YM
authors.lastname: Tzou
authors.forename: Y
authors.initials: Y
authors.lastname: Deng
authors.forename: K J
authors.initials: KJ
authors.lastname: Tseng
authors.forename: C C
authors.initials: CC
authors.lastname: Chen
authors.forename: M K
authors.initials: MK
authors.lastname: Wang
mesh_terms: D002840:Chromates / Q000737:chemistry*; D006358:Hot Temperature; D010084:Oxidation-Reduction; D012987:Soil / Q000737:chemistry*; D012989:Soil Pollutants / Q000737:chemistry*
chemical_list: D002840:Chromates; D012987:Soil; D012989:Soil Pollutants