Solver for the total alkalinity-pH equations
Determines [H+] concentration from Total alkalinity and dissolved total elements in sea water. Universal and robust algorithm from Munhoven (2013) with Newton- Raphson iterations
reference: Munhoven G. Munhoven G. (2013) Mathematics of the total alkalinity-pH equation – pathway to robust and universal solution algorithms: the SolveSAPHE package v1.0.1. Geoscientif. Model Dev. 6, 1367–1388
authors: Guy Munhoven and Jean-Marie Epitalon