1. Department of Chemistry, University of Otago, Dunedin 9014, New Zealand, Interdisciplinary Arts and Sciences Department, University of Washington, Bothell, Washington 98011, United States Geological Survey, Denver, Colorado 80225, United States Environmental Protection Agency-Western Ecology Division, Corvallis, Oregon 97333, Department of Chemistry and Department of Environmental and Molecular Toxicology, Oregon State University, Corvallis, Oregon 97331