Cadmium chemical form in mine waste materials by X-ray absorption spectroscopy

Diacomanolis, V., Ng, J. C., Sadler, R., Harris, H. H., Nomura, M. and Noller, B. N. (2010). Cadmium chemical form in mine waste materials by X-ray absorption spectroscopy. In: R. Garrett, I. Gentle, K. Nugent and S. Wilkins, SRI 2009: 10th International Conference on Synchrotron Radiation Instrumentation. SRI09: The 10th International Conference on Synchrotron Radiation Instrumentation, Melbourne, VIC, Australia, (915-918). 27 September-2 October 2009. doi:10.1063/1.3463365

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Author Diacomanolis, V.
Ng, J. C.
Sadler, R.
Harris, H. H.
Nomura, M.
Noller, B. N.
Title of paper Cadmium chemical form in mine waste materials by X-ray absorption spectroscopy
Conference name SRI09: The 10th International Conference on Synchrotron Radiation Instrumentation
Conference location Melbourne, VIC, Australia
Conference dates 27 September-2 October 2009
Proceedings title SRI 2009: 10th International Conference on Synchrotron Radiation Instrumentation   Check publisher's open access policy
Journal name AIP Conference Proceedings   Check publisher's open access policy
Place of Publication Melville, NY, U.S.A.
Publisher Springer New York
Publication Year 2010
Sub-type Poster
DOI 10.1063/1.3463365
ISBN 9780735407824
0735407827
9780735407794
0735407797
ISSN 0094-243X
1551-7616
1935-0465
Editor R. Garrett
I. Gentle
K. Nugent
S. Wilkins
Volume 1234
Start page 915
End page 918
Total pages 4
Collection year 2011
Language eng
Formatted Abstract/Summary
This study examines the molecular form of cadmium (Cd) present in mine wastes by X-ray Absorption Spectroscopy (XAS; Cd>20 mg/kg) using the K-edge of Cd at the Photon Factory Advanced Ring (PF-AR), NW10A beam line at KEK-Tsukuba-Japan. Mine waste materials and zinc concentrate were analyzed for Cd by ICPMS prior to undertaking XAS (range 21-452 mg/kg). Model compounds (CdO, Cd(OH)2, CdCO3, Cdacetate, CdS, Cdstearate, CdDEDTC) and samples were examined in solid form at 20 K. The XANES spectra showed similar E max values for both model compounds and samples. The EXAFS showed that Cd-S in CdS, gives a flatter spectrum in the extended region compared to Cd-O found with CdCO3, CdO and Cd Stearate. Linear combination fitting with model Cd compounds did not give clear assignments of composition, indicating that more detailed EXAFS spectra is required as mineral forms containing Cd were present rather than simple Cd compounds such as CdCO3. The Cd bond for a single shell model in mine waste sample matrices appears to be either Cd-O or Cd-S, or a combination of both. Comparison of molecular data from the XAS studies with bioaccessibility data giving a prediction of bioavailability for mine waste materials provides useful information about the significance of the cadmium form as a contaminant for health risk assessment purposes.
© 2010 American Institute of Physics.
Keyword Bioavailability
Bonding
Cadmium
EXAFS
Q-Index Code EX
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Poster session II SPECTROSCOPY—TIME RESOLVED

 
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Created: Mon, 14 Mar 2011, 22:05:15 EST by Manjit Sanghera on behalf of National Res Centre For Environmental Toxicology