Content of PhD-studies
The aim of my PhD studies is to increase our understanding of how trace elements (mainly As, Ni, U, Mn, Ce et al.,) are released, transported and sequestered in different geological settings, such as mined black shale areas, estuaries associated with acid sulphate soils, and granitoid fractures at Äspö area, by combining different wet chemical methods (such as humidity cell test, sequential chemical extractions) and synchrotron-based techniques (mainly XANES, EXAFS and XPS).
Curriculum Vitae – short
2010-present: PhD study, Linnaeus University, Kalmar, Sweden. Main supervisor: Prof. Mats Åström, Co-supervisor: Dr. Pasi Peltola and Dr. Henrik Drake.
2006 – 2009: Master degree in environmental geochemistry, Hunan Normal University (China)
2002-2006: Bachelor degree in geography, Hunan Normal University (China)
- Synchrotron Beamtime 96 hours, MAX-Lab, Lund, Sweden (Proposal ID: 20120330). Mn chemistry (average valence and mineral phases) in unique mineral coatings from fractured granitoids in Sweden and Greenland, new insights into geochemical pathways and controls of toxic metals and radionuclides transportation at the interface between hydrosphere and granitoidic lithosphere. (Investigators: Changxun Yu., Mats Åström, Henrik Drake).
- Synchrotron Beamtime 144 hours, MAX-Lab, Lund, Sweden (Proposal ID: 20120137). Determination of Ce4+/Ce3+ ratios and their host phases in granitoidic fractures down to 1 km depth: implications for paleo-redox fronts, cerium retention and rare-earth element fractionation in the deep subsurface. (Investigators: Changxun Yu., Henrik Drake, Mats Åström).
- Approx. 28000 SEK. Strategic funding from Linnaeus University (LNU 2011/570) for a two-month academic visiting to Southern Cross Geoscience, Southern Cross University, Australia.
- Synchrotron Beamtime 96 hours, MAX-Lab, Lund, Sweden (Proposal ID: 20110329). Mineralization pathway of hyper-enriched Mn in estuarine sediments and its influence on other metals extensively leached from coastal lowland acid sulphate soils, Western Finland. (Investigators: Changxun Yu., Pasi Peltola).
- Nordic Summer school in Synchrotron Radiation Science “Advanced Research Using New X-ray Sources”. June 13-21, 2011.
Xu J.Z., Peng B., Yu C.X., Yang Y., Tang, X.Y., Tan C.Y., Xie S.R., Tu X.L., Bao Z.C., Quan M. J., Xiao M.L. Geochemistry of soils derived black shales in the Ganziping mine area,western Hunan, China. Environmental Earth Sciences. (Published online)
Yu C.X., Peng B, Peltola P., Tang X.Y., Xie S.R. (2012) Effect of weathering on abundance and release of potentially toxic elements in soils developed on Lower Cambrian black shales, P. R. China. Environmental Geochemistry and Health. 34: 375-390.
Peng B., Tang X.Y., Yu C.X, Tan C.Y., Yin C.Y., Yang G., Liu Q., Yang K.S., Tu X.L. (2011) Geochemistry of trace metals and Pb isotopes of sediments from the lowermost Xiangjiang River, Hunan Province (P. R. China): implications on sources of trace metals. Environmental Earth Sciences. 64: 1455-1473.
Peng B., Tang X.Y., Yu C.X., Xie S.R., Xiao M.L., Song Z.L., Tu X.L. (2009). Heavy metal geochemistry of acid mine drainage discharged from the Hejiacun uranium mine in central Hunan, China. Environmental Geology. 57: 421-434.
Peng B., Piestrzynski A, Pieczonka J, Xiao M.L., Wang Y.Z., Xie S.R., Tang X.Y., Yu C.X., Song Z.L. (2007). Mineralogical and geochemical constrains on environmental impacts from waste rock at Taojiang Mn-ore deposit, central Hunan, China. Environmental Geology. 52: 1277-296.
Yu, C.X., Virtasalo, J., Peltola, P., Österholm, P., Ojala, A., Åström, M. Enrichment and speciation of metals in estuarine sediments affected by acid sulfate soils in Western Finland. 7th International Acid Sulfate Soil Conference in Vaasa, Finland 2012.
Yu, C.X., Åström, M., Peltola, P., Drake, H. Oxidative Weathering of Black Shale: A Long-Term Humidity Cell Test, p. 2231. Goldschmidt 2011, Prague.