American Geosciences Institute
American Geosciences Institute: Earth Science Week: Global Change: Where Land, Air and Water Meet
To develop an understanding of parts per million as a concept, teams of young scholars create successive dilutions of a solution to reach a parts-per-million concentration.
Frostburg State University
Frostburg State University: Grams of Solution
Resource presents the answer to "How do I find grams of solute in a volume of solution, given parts per million?" in an easy-to-understand format.