Visual Display of Concentrations for Common Anions and Cations
The Piper diagram is commonly used to display ground water quality for major cations and anions. The diagram consists of a triangle of cations in the bottom left, a triangle of anion concentrations in the bottom right, and a diamond of cations/anion pairs in the top center. For each sample, one point is plotted in all three regions. Typically, the Piper diagram is plotted in meq/l.
In ChemPoint, the Piper diagram has the following characteristics:
- Only one diagram is produced at a time.
- The parameters displayed on the diagram can not be changed.
- The data for the graph can be limited by sample date or sampling location.
- You can use field names to specify custom graph titles and axis labels.
Useful references for Piper diagrams include Kehew (2001), Fetter (1988), and Davis and DeWeist (1966).