Joyce Clemente

Joyce Clemente

Postdoctoral Research Assistant

Current Project:

Interactions between metals and organics influence the solubility, degradability, and availability of both.  As well, metal composition and concentration, and organic carbon composition reflect sources and environmental conditions during deposition.

This project will contribute to understanding processes responsible for the co-enrichment of metals and organic matter in marine sediments.  Characterising recent sediments is expected to provide information on initial controls related to organo-metal sequestration, and why specific metals are enriched in high organic carbon deposits. In collaboration with scientists from Shell, we are using high resolution MS to characterize organic matter composition, which will complement metal analysis conducted at the department.

Previous Work:

Previous training in Microbiology and Environmental Chemistry focused on terrestrial systems.

  • Determining the effects organic carbon and nutrient rich amendments on metal mobility (e.g. acid mine drainage) from pyrrhotite-rich Cu/Ni mine tailings (Postdoctoral research).
  • Investigating the potential of biochars as amendments on metal mine tailings by identifying properties that could influence metal mobility (Postdoctoral research).
  • Soil organic matter composition impacts its degradability and association with soil minerals (Ph.D. thesis).
  • Characterization, analysis and biodegradation of naphthenic acids (M.Sc. thesis).
  1.  Clemente, J.S., Beauchemin, S., MacKinnon, T., Martin, J., Johnston, C.T., and Joern, B., 2017. Initial biochar properties related to the removal of As, Se, Pb, Cd, Cu, Ni, and Zn from an acidic suspension. Chemosphere 170, 216-224. DOI: 10.1016/j.chemosphere.2016.11.154.
  2. Clemente, J.S., Simpson, A.J., and Simpson, M.J., 2011. Association of specific organic matter compounds in size fractions of soils under different environmental controls. Organic Geochemistry 42, 1169-1180. DOI: 10.1016/j.orggeochem.2011.08.010.
  3. Clemente, J.S., MacKinnon, M.D., and Fedorak, P.M., 2004. Aerobic biodegradation of two commercial naphthenic acids preparations. Environmental Science & Technology 38, 1009-1016. DOI: 10.1021/es030543j.
  1. Clemente, J.S., Huntsman, P., on-line Just-IN article Feb 28, 2019. Potential climate change effects on the geochemical stability of waste and mobility of elements in receiving environments for Canadian metal mines South of 60o. Environmental Reviews. http://dx.doi.org/10.1139/er-2017-0092.
  2. Beauchemin, S., Clemente, J.S., Thibault, Y., Langley, S., Gregorich, E.G., and Tisch, B., 2018 Geochemical stability of acid-generating pyrrhotite tailings, 4 to 5 years after addition of oxygen-consuming organic covers. Science of the Total Environment 645, 1643-1655. DOI: 10.1016/j.scitotenv.2018.07.261.
  3. Clemente, J.S., Beauchemin, S., Thibault, Y., MacKinnon, T., and Smith, D., 2018. Differentiating inorganics in biochars produced at commercial scale using principal component analysis. ACS Omega 3(6) 6931-6944. http://doi.org/10.1021/acsomega.8b00523.
  4. Beauchemin, S., Clemente, J.S., MacKinnon, T., Tisch, B., Lastra, R., Smith, D., and Kwong, J., 2015. Metal leaching in mine tailings: short-term impact of biochar and wood ash amendments. Journal of Environmental Quality 44, 275-285. DOI: 10.2134/jeq2014.04.0195.
  5. Whalen, J.K., Gul, S., Poirier, V., Yanni, S.F., Simpson, M.J., Clemente, J.S., Feng, X., Grayston, S.J., Barker, J., Ishimaru, K., Gregorich, E.G., Angers, D.A., Rochette, P., and Janzen, H., 2014. Transforming plant carbon into soil carbon: process-level controls on carbon sequestration. Canadian Journal of Plant Science 94, 1065-1073. DOI: 10.4141/CJPS2013-145.
  6. Clemente, J.S. and Simpson, M.J., 2013. Physical protection of lignin by organic matter and clay minerals from chemical oxidation. Organic Geochemistry 58, 1-12. DOI: 10.1016/j.orggeochem.2013.02.007.
  7. Clemente, J.S., Simpson, M.J., Simpson, A.J., Yanni, S.F., and Whalen, J.K., 2013. Comparison of soil organic matter composition after incubation with maize leaves, roots, and stems. Geoderma 192, 86-96. DOI: 10.1016/j.geoderma.2012.08.007.
  8. Clemente, J.S., Gregorich, E.G., Simpson, A.J., Kumar, R., Courtier-Murias, D., and Simpson, M.J., 2012. Comparison of nuclear magnetic resonance methods for the analysis of organic matter composition from soil density and particle fractions. Environmental Chemistry 9, 97-107. DOI: 10.1071/EN11096.
  9. Clemente, J.S., and Fedorak, P.M., 2005. A review of the occurrence, analysis, toxicity and biodegradation of naphthenic acids. Chemosphere 60, 585-600. DOI: 10.1016/j.chemosphere.2005.02.065.
  10. Clemente, J.S., and Fedorak, P.M., 2004. Evaluation of the analyses of t-butyldimethylsilyl derivatives of naphthenic acids by gas chromatography-electron impact mass spectrometry. Journal of Chromatography A 1047, 117-128. DOI: 10.1016/j.chroma.2004.06.065.
  11. Clemente, J.S., Yen, T.-W., and Fedorak, P.M., 2003. Development of a high performance liquid chromatography method to monitor the biodegradation of naphthenic acids. Journal of Environmental Engineering and Science 2, 177-186. DOI: 10.1139/S03-011.
  12. Clemente, J.S., Prasad, N.G.N., MacKinnon, and M.D., Fedorak, P.M., 2003. A statistical comparison of naphthenic acids characterized by gas chromatography-mass spectrometry. Chemosphere 50, 1265-1274. DOI: 10.1016/S0045-6535(02)00763-4.