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Unveiling the potential mobility and geochemical speciation of geogenic arsenic in the deep subsurface soil of the Tokyo metropolitan area.
J Hazard Mater
November 2024
Research Institute for Geo-Resources and Environment, National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki 305-8567, Japan.
Article Synopsis
- Excavations for urban development can lead to soil and groundwater contamination with geogenic arsenic (As), necessitating effective management strategies due to the large volume of soil being moved annually.
- The study analyzed soil samples from Tokyo’s Yurakucho and Kanto Loam Formations, finding higher total arsenic concentrations and water-soluble As in the Yurakucho Formation compared to the Kanto Loam Formation.
- It identified that arsenic is mostly found in sulfide forms in the Yurakucho Formation, emphasizing the need to understand arsenic’s chemical forms to evaluate its environmental risks during excavation processes.
Development of a scanning soft X-ray spectromicroscope to investigate local electronic structures on surfaces and interfaces of advanced materials under conditions ranging from low vacuum to helium atmosphere.
J Synchrotron Radiat
May 2020
RIKEN SPring-8 Center, 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5148, Japan.
A scanning soft X-ray spectromicroscope was recently developed based mainly on the photon-in/photon-out measurement scheme for the investigation of local electronic structures on the surfaces and interfaces of advanced materials under conditions ranging from low vacuum to helium atmosphere. The apparatus was installed at the soft X-ray beamline (BL17SU) at SPring-8. The characteristic features of the apparatus are described in detail.
View Article and Find Full Text PDFA micro-focusing and high-flux-throughput beamline design using a bending magnet for microscopic XAFS at the High Energy Photon Source.
J Synchrotron Radiat
September 2019
Institute of High Energy Physics, 19B Yuquan Road, Shijingshan District, Beijing, People's Republic of China.
An optical design study of a bending-magnet beamline, based on multi-bend achromat storage ring lattices, at the High Energy Photon Source, to be built in Beijing, China, is described. The main purpose of the beamline design is to produce a micro-scale beam from a bending-magnet source with little flux loss through apertures. To maximize the flux of the focal spot, the synchrotron source will be 1:1 imaged to a virtual source by a toroidal mirror; a mirror pair will be used to collimate the virtual source into quasi-parallel light which will be refocused by a Kirkpatrick-Baez mirror pair.
View Article and Find Full Text PDFMedium-energy microprobe station at the SXRMB of the CLS.
J Synchrotron Radiat
January 2017
Department of Chemistry, The University of Western Ontario, 1151 Richmond Street, London, ONT, Canada N6A 5B7.
Micro-XAFS and chemical imaging techniques have been widely applied for studies of heterogeneously distributed systems, mostly in hard X-ray (>5 keV) or in soft X-ray (<1.5 keV) energies. The microprobe endstation of the SXRMB (soft X-ray microcharacterization beamline) at the Canadian Light Source is optimized at the medium energy (1.
View Article and Find Full Text PDFA sub-micrometer resolution hard X-ray microprobe system of BL8C at Pohang Light Source.
J Synchrotron Radiat
September 2015
Gyeongju National Museum, Gyeongju 780-150, South Korea.
A microprobe system has been installed on the nanoprobe/XAFS beamline (BL8C) at PLS-II, South Korea. Owing to the reproducible switch of the gap of the in-vacuum undulator (IVU), the intense and brilliant hard X-ray beam of an IVU can be used in X-ray fluorescence (XRF) and X-ray absorption fine-structure (XAFS) experiments. For high-spatial-resolution microprobe experiments a Kirkpatrick-Baez mirror system has been used to focus the millimeter-sized X-ray beam to a micrometer-sized beam.
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