1. Bingham Research Center, Utah State University, Vernal, Utah 84078, United States
2. Department of Chemistry and Biochemistry, Utah State University, Logan, Utah 84322-0305, United States
3. Environmental Studies Program, Colorado College, Colorado Springs, Colorado 80903-3298, United States
4. Department of Natural Resources and Environmental Science, University of Nevada—Reno, Reno, Nevada 89557, United States