Gus

Hello, I have a data set that has alkalinity reported as HCO3 and CO3 for samples before a certain date and HCO3, CO3, and CaCO3 for others after that date. On the piper diagram they plot in very different areas, but if I remove the alkalinity as CaCO3 from the data set then those samples plot with the rest. How is the alkalinity portion of the piper diagram calculated? If I include the alkalinity as CaCO3 with the HCO3 and CO3 am I double counting? Any help is appreciated. Cheers, Gus