Chromium speciation in mildly heated Cr(VI)-doped latosol soil.
Cr(VI) chemical reduction in natural organic matter (NOM)-bearing latosol soil was investigated under various heating conditions at < or = 378 K. An enhanced Cr(VI) reduction rate has been observed for the reaction at 353-378 K. The effect of Fe(II) naturally occurring in the latosol soil on Cr(VI) chemical reduction is negligible compared with the effect of NOM. Cr(OH)(3) was quantitatively specified by X-ray absorption spectroscopy to be the key chromium species ( approximately 80%) after approximately 90% of Cr(VI) was chemically reduced by NOM at 353-378 K. This study indicates a potential strategy for using the heat extracted from industrial flue gas with a heat exchanger to chemically reduce Cr(VI) in NOM-bearing or organics-amended soils that contain Cr(VI).
Department of Environmental Science and Engineering, Tunghai University, Taichung City 407, Taiwan. yulin@thu.edu.tw
Yu-Ling
YL
Wei
Hui-Fang
HF
Hsieh
Yen-Shiun
YS
Peng
Kai-Wen
KW
Chen
Chang-Yuan
CY
Lin
H Paul
HP
Wang
D002857:Chromium / Q000737:chemistry*; D005296:Ferrous Compounds / Q000737:chemistry; D006358:Hot Temperature; D010084:Oxidation-Reduction; D012987:Soil / Q000032:analysis*; D012989:Soil Pollutants / Q000032:analysis; D056928:X-Ray Absorption Spectroscopy
D005296:Ferrous Compounds; D012987:Soil; D012989:Soil Pollutants; D002857:Chromium