Pradyot Patnaik, PhD, is the Director of the Environmental Chemistry Laboratory of the Interstate Environmental Commission at Staten Island, New York, and a research investigator at the Center for Environmental Science of the City University of New York at the College of Staten Island. He is also an Adjunct Professor at the New Jersey Institute of Technology at Newark and at the Community College of Philadelphia. Dr. Patnaik is the author of Handbook of Environmental Analysis, Handbook of Inorganic Chemicals, and Deans' Analytical Chemistry Handbook, Second Edition.