XAFS Measurement System in the Soft X-ray Region for Various Sample Conditions and Multipurpose Measurements

Nakanishi, Koji; Ohta, Toshiaki

doi:10.5772/37395

Cited by 1 publication

(1 citation statement)

References 23 publications

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“…Sulfur K-edge XANES spectra were taken with a soft Xray XAFS beamline BL-10 in the SR Center, Ritsumeikan University in Japan in the period from July 2013 to February 2014. The beamline consisted of a thin Be filter, a Ni-coated Si toroidal mirror, a Golovchenko-type double-crystal monochromator (DMC) [14], I 0 monitor, a high-vacuum (HV) sample chamber kept below 2 × 10 −5 Pa, an atmospheric-pressure (AP) sample chamber, and some masks and slits [15]. Germanium (111) and Si (111) were used for monochromatizing X-rays.…”

Section: Xanes Spectroscopymentioning

confidence: 99%

XANES Spectroscopy for Determining the Chemical States of Sulfur Species in the Sediment of Lake Biwa

Takemoto

Bamba

Ogawa

et al. 2016

J. of Wat. & Envir. Tech.

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Synchrotron-based X-ray absorption near edge structure (XANES) spectroscopy was applied to study sulfur species in the sediments of Lake Biwa. Samples were collected at Nagahama Port where muddy substances were deposited all year around. The XANES analysis revealed the presence of reduced inorganic S (e.g. FeS, FeS 2 , and element S), reduced organic S (e.g. methionine), intermediate S (e.g. sulfonate), and oxidized S (e.g. sulfate). By storing the sediments under aerobic condition, the most reduced inorganic S nearly faded out after seven months, and oxidized S increased extremely. On the contrary, under anaerobic condition, the population of each species remained unchanged, except a slight decrease of the most reduced inorganic S in the first week, which might be due to biological oxidization. It is proved that XANES is not only a non-invasive method to determine the chemical states of S species in the sediments, but also to trace the oxidation state of the sediment consisting of solid and liquid.

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Section: Xanes Spectroscopymentioning

confidence: 99%