Institut de Chimie Moléculaire de Reims (ICMR), UMR CNRS 7312, Université de Reims Champagne-Ardenne , Faculté des Sciences, B.P. 1039, Reims 51687 Cedex 2, France.
Environ Sci Technol. 2014 Jul 1;48(13):7237-44. doi: 10.1021/es5005522. Epub 2014 Jun 19.
Metal solid phase speciation plays an important role in the control of the long-term stability of metals in biosolid-amended soils. The present work used pH-adsorption edge experiments and synchrotron-based spectroscopy techniques to understand the solid phase speciation of copper, nickel and zinc in a biosolid-amended soil. Comparison of metal adsorption edges on the biosolid-amended soil and the soil sample showed that Cu, Ni, and Zn can be retained by both soil and biosolid components such as amorphous iron phases, organic matter and clay minerals. These data are combined with microscopic results to obtain structural information about the surface complexes formed. Linear combination fitting of K-edge XANES spectra of metal hot-spots indicated consistent differences in metal speciation between metals. While organic matter plays a dominant role in Ni binding in the biosolid-amended soil, it was of lesser importance for Cu and Zn. This study suggests that even if the metals can be associated with soil components (clay minerals and organic matter), biosolid application will increase metals retention in the biosolid-amended soil by providing reactive organic matter and iron oxide fractions. Among the studied metals, the long-term mobility of Ni could be affected by organic matter degradation while Cu and Zn are strongly associated with iron oxides.
金属固相形态在控制生物固体改良土壤中金属的长期稳定性方面起着重要作用。本研究采用 pH 吸附边缘实验和基于同步辐射的光谱技术来了解生物固体改良土壤中铜、镍和锌的固相形态。比较生物固体改良土壤和土壤样品上的金属吸附边缘表明，Cu、Ni 和 Zn 可以被土壤和生物固体成分（如无定形铁相、有机质和粘土矿物）保留。这些数据与微观结果相结合，获得了表面配合物形成的结构信息。金属热点 K 边 XANES 光谱的线性组合拟合表明，金属形态在金属之间存在一致的差异。虽然有机质在生物固体改良土壤中对 Ni 的结合起主导作用，但对 Cu 和 Zn 的作用较小。本研究表明，即使金属可以与土壤成分（粘土矿物和有机质）结合，生物固体的应用也会通过提供反应性有机质和氧化铁分数来增加生物固体改良土壤中金属的保留。在所研究的金属中，Ni 的长期迁移性可能会受到有机质降解的影响，而 Cu 和 Zn 则与氧化铁强烈相关。
