ID 111235
Title Alternative
Analysis of Valence for Chromium in Soil and Plastic Samples Using Laboratory XAFS Spectrometer
Author
Miyauchi, Hiroya Technology Center for Small and Medium Enterprises|Kyoto University
Nakanishi, Sadahiro Technology Center for Small and Medium Enterprises
Kawai, Jun Kyoto University
Keywords
laboratory XAFS
XANES
hexavalent chromium
soil
plastic
Content Type
Journal Article
Description
Hexavalent {Cr(VI)} and trivalent chromium {Cr(III)} in environmental materials such as soil and plastics were investigated using a laboratory X-ray absorption fine structure (XAFS) spectrometer equipped a W anode X-ray tube. The Cr-K X-ray absorption edges were observed on the XANES spectra of soil (total chromium 606 ppm) and plastic (213 ppm) samples with a fluorescence mode, while the signal-to-noise (SN) ratios of these spectra were too low to determine the height of pre-edge peak of Cr(VI) and the value of the energy on the Cr-K X-ray absorption edge. The XANES spectra of reference samples prepared by Cr2O3 {Cr(III)} and CrO3 {Cr(VI)} particle reagents were also recorded with the transmission mode. In order to improve the SN ratios of XANES spectra, a smoothing treatment by Savitzky-Golay method was applied to the XANES spectra of the soil and plastic samples. By the smoothing treatment, SN ratios of these spectra were improved, though the height of pre-edge peak on the XANES spectra of Cr(VI) reference sample had decreased less than 5%. The height of pre-edge peak and the value of the energy on the Cr-K X-ray absorption edge of soil and plastic samples were given by smoothed XANES spectra. Using the height of pre-edge peak and the value of the energy on the Cr-K X-ray absorption edge of reference samples, the ratios of Cr(VI)/Cr(III) on the soil and plastic samples were calculated.
Journal Title
BUNSEKI KAGAKU
ISSN
05251931
NCID
AN00222633
AA11681958
Publisher
日本分析化学会
Volume
58
Issue
4
Start Page
321
End Page
325
Published Date
2009-05-04
Rights
© The Japan Society for Analytical Chemistry 2009
EDB ID
DOI (Published Version)
URL ( Publisher's Version )
FullText File
language
jpn
TextVersion
Publisher
departments
Science and Technology