Absorption and Mobility of Cr and Zn in Soil in the Vicinity of Jordan River

16th International Conference on X-ray Absorption Fine Structure

Harfouche, M.^1 ; Ghrair, A.M.^2 ; Jaradat, D.M.M.^3 ; Aquilanti, G.^4 ; Jaber, R.^5 ; Aldrabee, A.^6 ; Sawai, N.^1

Synchrotron-light for Experimental Science and Applications in the Middle East (SESAME), Allan

19252, Jordan^1

Royal Scientific Society, Applied Scientific Research Commission, Amman, Jordan^2

Department of Chemistry, Faculty of Science, Al-Balqa' Applied Univ., Al-Salt, Jordan^3

Elettra - Sincrotrone Trieste S.C.p.A.s.s., Basovizza, Trieste

34149, Italy^4

University of Jordan, Department of Civil Engineering, Amman

11941, Jordan^5

Jordan Atomic Energy Commission (JAEC), Amman

11934, Jordan^6

关键词: Accumulation mechanisms;    Coordination sphere;    Inter-atomic distances;    Jordan river;    Local order;    Oxygen atom;    Soil matrices;    Sulfur atoms;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/712/1/012080/pdf
DOI  :  10.1088/1742-6596/712/1/012080

来源: IOP

【 摘 要 】

Sediments from the basin of Jordan River are to some extent significantly contaminated by heavy metals. The goal of this study was to examine the nature of the heavy metals, their mobility, and their binding in the soil matrix in order to understand the accumulation mechanism. Exhaustive mineralogical and geochemical study on the heavy metals in the vicinity of the river will allow knowing the dominant forms of emitted metals. The structural local order around Cr and Zn in soil samples were investigated by analyzing XAFS data. Our investigations show that the coordination sphere, around both Cr and Zn, is constituted of oxygen atoms at an interatomic distance of ∼2 Å which is close to those in clay minerals. It is also shown that Cr(III) is the most dominating redox state in soil samples. Moreover, the next backscattering neighbors around Zn and Cr are either carbon or sulfur atoms which reveal a multiple and heterogeneous speciation of Cr and Zn with organic matter.