Contact Information

  • Robert M. Hanson
  • Professor
  • Chemistry
  • St. Olaf College
  • 1520 St. Olaf Ave.
  • Northfield, MN 55057
(507) 646 - 3107

Green Chemistry Assistant

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The Green Chemistry Assistant (GCA) is a collaborative project between St. Olaf College and the U.S. Environmental Protection Agency that allows analysis of chemical equations, reactions, and processes in terms of green chemistry, safety, and chemical hazards. Geared toward a broad range of users, the site focuses on single- or multi-step processes for which the balanced chemical equations are known. Concepts such as atom economy, theoretical yield, experimental atom economy, process mass efficiency, and E-factor are explained and are calculated based on balanced chemical equations and experimental quantities introduced by users.

Summary prepared, November 2005, by Bob Hanson, Department of Chemistry, St. Olaf College.


Hanson, R. M.; Campbell, P. R. Green Chemistry Assistant. gca (accessed June 2011).

Category Descriptors

Green Chemistry Principles
  • Analyze in Real-Time to Prevent Pollution
  • Avoid Chemical Derivatives
  • Design for Degradation
  • Design Less Hazardous Chemical Syntheses
  • Design Safer Chemicals and Products
  • Increase Energy Efficiency
  • Maximize Atom Economy
  • Minimize the Potential for Accidents
  • Prevent Waste
  • Use Catalysts
  • Use Renewable Feedstocks
  • Use Safer Solvents/Reaction Conditions
Chemistry Subdiscipline
  • Interdisciplinary/Multidisciplinary
  • Organic Chemistry
Target Audience
  • Colleges/Universities
  • Internet Sources