Department of Geosciences, and Earth System Science Research Centre, Johannes Gutenberg-University, Mainz, Germany.
J Synchrotron Radiat. 2010 Mar;17(2):193-201. doi: 10.1107/S090904950905465X. Epub 2010 Feb 2.
X-ray absorption near-edge spectroscopy (XANES) at the Mn K-edge was used to investigate the environment of Mn in situ within the growth increments of the long-lived freshwater bivalve species Diplodon chilensis patagonicus. Single XANES spectra and Mn Kalpha fluorescence distributions were acquired at submillimetre resolution (up to 100 microm x 50 microm), at Mn concentrations below the weight percent range (100-1000 microg g(-1)) in a high Ca matrix. The position and intensity of the pre-edge feature in the shell spectrum resembles best that of the Mn(II)-bearing reference compounds, suggesting that this is the oxidation state of Mn in the bivalve shells. By comparison with the XANES spectra of selected standard compounds, hypotheses about Mn speciation in the shell are also reported. In particular, different factors, such as provenance, ontogenetic age, variable Mn-concentrations or seasonal shell deposition seem not to influence the speciation of the metal in this bivalve species.
X 射线吸收近边光谱（XANES）在锰 K 边缘被用来研究在长寿淡水双壳类物种智利贻贝 patagonicus 的生长增量中锰的原位环境。在高钙基质中，以亚毫米分辨率（高达 100 微米 x 50 微米），在低于重量百分比范围（100-1000 微克 g(-1))的锰浓度下，获得了单个 XANES 光谱和锰 Kalpha 荧光分布。壳谱中预边特征的位置和强度与含锰（II）参考化合物最相似，表明这是双壳类贝壳中锰的氧化态。通过与选定标准化合物的 XANES 光谱进行比较，还报告了关于壳中锰形态的假设。特别是，不同的因素，如来源、个体年龄、可变的锰浓度或季节性贝壳沉积，似乎不会影响这种双壳类动物物种中金属的形态。
