Department of Environmental Science and Engineering, Tunghai University, Taichung City 407, Taiwan.
J Synchrotron Radiat. 2010 Mar;17(2):173-8. doi: 10.1107/S0909049509051243. Epub 2010 Feb 2.
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).
在各种加热条件下研究了含有天然有机物（NOM）的拉托土壤中六价铬的化学还原情况，温度范围为<或=378K。在 353-378K 的反应中观察到了增强的六价铬还原速率。与 NOM 的影响相比，拉托土壤中天然存在的 Fe(II)对六价铬化学还原的影响可以忽略不计。通过 X 射线吸收光谱定量确定 Cr(OH)(3)是在 353-378K 下通过 NOM 化学还原约 90%的六价铬后形成的关键铬物种（约 80%）。这项研究为使用热交换器从工业烟道气中提取的热量来化学还原含有六价铬的 NOM 或有机物改良土壤中的六价铬提供了一种潜在策略。
