1. Natural Resources and Environmental Studies Graduate Program, University of Northern British Columbia, Prince George, British Columbia V2N 4Z9, Canada
2. Ecosystem Science & Management Program, University of Northern British Columbia, Prince George, British Columbia V2N 4Z9, Canada
3. Canadian Light Source, Inc., Saskatoon, Saskatchewan S7N 2V3, Canada
4. Environmental Science Program, University of Northern British Columbia, Prince George, British Columbia V2N 4Z9, Canada
5. Chemistry Program, University of Northern British Columbia, Prince George, British Columbia V2N 4Z9, Canada
6. School of Energy and Power Engineering, Changsha University of Science & Technology, Changsha CN 410114, P.R. China