1. Analytical Chemistry, Institute of Physics, University of Augsburg, D-86159 Augsburg, Germany, Institute of Ecological Chemistry, GSFNational Research Centre for Environment and Health, D-85764 Neuherberg, Germany, British American Tobacco, R&D Centre, Southampton SO15 8TL, U.K., and Environmental Chemistry, BIfABavarian Institute of Applied Environmental Research and Technology GmbH, D-86167 Augsburg, Germany