Analysis of Th(IV)-humate by XPS
Analysis of Th(IV)-humate by XPS
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DOI：
10.1524/ract.2000.88.9-11.587
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发表时间：
2000
影响因子：
1.8
通讯作者：
D. Schild;C. Marquardt
中科院分区：
文献类型：
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作者：
D. Schild;C. Marquardt
研究了腐植酸与四价吖系金属离子的络合作用及其成键类型。在溶液中制备了腐植酸Th(IV)，用超滤分离，并用X射线光电子能谱(XPS)对其进行了分析。用高分辨率XPS验证了腐植酸在长期辐照下对X射线降解的稳定性。Th(IV)-腐植酸盐的Th4f7/2谱线可用一个高斯-洛伦兹函数来拟合，表明络合主要涉及一种键。与其他Th(IV)-化合物相比，Th(IV)-腐殖酸盐的Th~4f谱类似于只含有羧基的离子交换剂的Th(IV)-络合物。目前的XPS研究证实了EXAFS的结果，即Th(IV)主要与腐植酸的羧基结合，并证明了XPS技术在表征金属-腐植酸盐络合物方面的适用性。
The tetravalent actinide humate complexation was investigated for types of bonding between Th(IV) and humic acid. The Th(IV)-humate was prepared in solution, separated by ultrafiltration and analyzed by X-ray photoelectron spectroscopy (XPS). The stability of humic acid against X-ray induced degradation was verified by high-resolution XPS during long-term irradiation. The Th 4f7/2 line of Th(IV)-humate can be fitted by one Gaussian-Lorentzian function, indicating that one type of bonding is mainly involved in the complexation. The Th 4f spectrum of Th(IV)-humate is, as compared to those of other Th(IV)-compounds, similar to the Th(IV)-complex with an ion exchanger containing carboxylic functional groups only. The present XPS study corroborates EXAFS results, according to which Th(IV) is predominantly bound to carboxylic groups of humic acid and demonstrates the applicability of the XPS technique for the characterization of metal-humate complexes.