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In 2013, EPA published final national recommended water quality criteria for the protection of aquatic life from the toxic effects of ammonia in freshwater.Want to share your content on R-bloggers? click here if you have a blog, or here if you don't.
http://www.epa.gov/wqc/aquatic-life-criteria-ammonia
These criteria are a function of water temperature and pH, so that the criteria concentration value changes with changing pH and temperature. Frequently the criteria values are plotted as a slice with one of the two variables held constant. But I wanted to see what the total criteria space looked like. One way to do this is with a 3D plot with the independent temperature and pH variables on the x and y axes (the horizontal plane) and the dependent Ammonia concentration on the z axis (vertical). Since shape of the surface is difficult to see from any one perspective, animation helps show the overall shape.
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