About the editor Ray E. Clement, PhD, is Senior Scientist with the Ontario Ministry of the Environment, Laboratory Services Branch. He is also Adjunct Executive Director of the Canadian Institute for Research in Atmospheric Chemistry and Honorary Professor at the University of Western Ontario, Chemistry Department. He has served on the editorial board of the journal Chemosphere and published 75 articles in numerous scientific publications. His books include Basic Gas Chromatography--Mass Spectrometry: Principles and Techniques and Emissions from Combustion Processes: Origin, Analysis, Fate. Dr. Clement received his PhD in analytical chemistry from the University of Waterloo.