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![[Figure 3]](xt0008fig3mag.jpg)
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Figure 3
X-ray absorption spectra from in situ analyses of shells and reference materials. The spectra are normalized between 0 and an edge jump of 1 and shifted vertically for clarity. (a) Three shell bands with high, medium and low Mn concentrations in lake sample AS07LS0026 are compared to detect speciation differences with the metal concentration; beam size on the sample was 100 µm × 50 µm. (b) A high Mn concentration band in the juvenile shell section and one in the adult section of the same specimen are compared to detect possible differences in Mn speciation related to ontogeny; beam size on the sample was 100 µm × 50 µm. (c) Spectra from Mn-rich bands in an adult shell area of the river (AS07RM0018) and the lake (AS07LS0026) sample were compared to detect possible differences owing to living environment; beam size on the sample was 100 µm × 50 µm. (d) A fraction of a Mn-rich aragonite crystal and a sample of a Diplodon periostracum were analyzed as pure inorganic and organic reference samples and compared with a shell spectrum of sample AS07LS0026 acquired under the same conditions (beam size on the sample was 350 µm × 200 µm, 3 s acquisition time). Line a in (d) marks the white line of the Mn Kα edge (at 6552 eV) and line b shows the position of the secondary peak at 6564 eV in the shell spectrum. |
![[Figure 3]](xt0008fig3.jpg)
 | JOURNAL OF SYNCHROTRON RADIATION |
ISSN: 1600-5775
