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Type: Conference paper
Title: Identification of lead chemical form in mine waste materials by X-ray absorption spectroscopy
Author: Taga, R.
Zheng, J.
Huynh, T.
Ng, J.
Harris, H.
Noller, B.
Citation: Proceedings of 10th International Conference on Synchrotron Radiation Instrumentation, 27 September–2 October 2009, Melbourne, Australia: pp.947-950
Publisher: AIP
Publisher Place: USA
Issue Date: 2010
Series/Report no.: AIP Conference Proceedings
ISBN: 9780735407824
ISSN: 0094-243X
Conference Name: International Conference on Synchrotron Radiation Instrumentation (10th : 2009 : Melbourne, Victoria)
Editor: Garrett, R.
Gentle, I.
Nugent, K.
Wilkins, S.
Statement of
Raijeli L. Taga, Jiajia Zheng, Trang Huynh, Jack Ng, Hugh H. Harris and Barry Noller
Abstract: X-ray absorption spectroscopy (XAS) provides a direct means for measuring lead chemical forms in complex samples. In this study, XAS was used to identify the presence of plumbojarosite (PbFe6(SO4)4(OH)12) by lead L3-edge XANES spectra in mine waste from a small gold mining operation in Fiji. The presence of plumbojarosite in tailings was confirmed by XRD but XANES gave better resolution. The potential for human uptake of Pb from tailings was measured using a physiologically based extract test (PBET), an in-vitro bioaccessibility (BAc) method. The BAc of Pb was 55%. Particle size distribution of tailings indicated that 40% of PM10 particulates exist which could be a potential risk for respiratory effects via the inhalation route. Food items collected in the proximity of the mine site had lead concentrations which exceed food standard guidelines1. Lead within the mining lease exceeded sediment guidelines2. The results from this study are used to investigate exposure pathways via ingestion and inhalation for potential risk exposure pathways of Pb in that locality. The highest Pb concentration in soil and tailings was 25,839 mg/kg, exceeding the Australian National Environment Protection Measure (NEPM) soil health investigation levels.
Keywords: XANES
gold mining
risk assessment
Description: Also cited as a journal article: AIP Conference Proceedings, 2010; 1234 : 947-950
Rights: © 2010 American Institute of Physics
DOI: 10.1063/1.3463374
Appears in Collections:Aurora harvest 5
Chemistry and Physics publications
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