Department of Applied Chemistry, College of Bioscience and Chemistry, Kanazawa Institute of Technology, 7-1 Ohgigaoka, Nonoichi, Ishikawa 921-8501, Japan.
Anal Chem. 2011 Oct 1;83(19):7566-9. doi: 10.1021/ac201606c. Epub 2011 Sep 6.
A Kβ satellite peak in X-ray fluorescence (XRF) spectra is observed as a counterpart of the pre-edge peak of the X-ray absorption near edge structure (XANES). In Kβ emission of chromium, a small satellite peak is observed at 5.983-5.988 keV only for hexavalent chromium compounds such as CrO(3), Na(2)CrO(7)·2H(2)O, Na(2)CrO(4)·4H(2)O, K(2)Cr(2)O(7), K(2)CrO(4), Zn(2)CrO(4)(OH)(2)·2H(2)O, PbCrO(4), and BaCrO(4), together with the main peak at 5.947 keV, while trivalent chromium compounds such as Cr(2)O(3) and Cr(OH)(3)·nH(2)O show only the main peak at 5.947 keV. This corresponds to the fact that the K pre-edge peak in XANES is observed only for the hexavalent chromium compounds. The electronic level causing the satellite peak is almost at the same energy level as that causing the pre-edge peak. Our finding not only affects the interpretation of the origin of the pre-edge peaks but also leads to the simple speciation method of chromium compounds using XRF.
X 射线荧光（XRF）光谱中观察到 Kβ 卫星峰，作为 X 射线吸收近边结构（XANES）的预边缘峰的对应峰。在铬的 Kβ 发射中，仅在六价铬化合物如 CrO(3)、Na(2)CrO(7)·2H(2)O、Na(2)CrO(4)·4H(2)O、K(2)Cr(2)O(7)、K(2)CrO(4)、Zn(2)CrO(4)(OH)(2)·2H(2)O、PbCrO(4)和 BaCrO(4)中观察到 5.983-5.988keV 的小卫星峰，与主峰 5.947keV 一起，而三价铬化合物如 Cr(2)O(3)和 Cr(OH)(3)·nH(2)O 仅显示主峰 5.947keV。这对应于 XANES 中仅观察到六价铬化合物的 K 预边缘峰的事实。引起卫星峰的电子能级几乎与引起预边缘峰的电子能级相同。我们的发现不仅影响了对预边缘峰起源的解释，而且还导致了使用 XRF 对铬化合物进行简单的形态分析方法。
