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CONCENTRATION UNITS, MEQ/L: A student of mine is trying to model water concentrations given in the literature as meq/L, but the program is not converting to molality. What is wrong?

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CONCENTRATION UNITS, MEQ/L: A student of mine is trying to model water concentrations given in the literature as meq/L, but the program is not converting to molality. What is wrong?

0
10

It’s a bug or perhaps a feature. The program only allows equivalents for the definition of alkalinity, no other element concentrations can be input as equivalents, it defaults back to mmol/L for everything but alkalinity. You’ll have to convert to mmol/L for calcium and other non-monovalent elements. • LEAKAGE IN 1D TRANSPORT SIMULATIONS: I’m a phd-student working on a semi-confined aquifer. I’m studying the relation between groundwater dynamics and the resulting chemical variation in the groundwater quality. I want to use PHREEQC for 1D transport coupled to chemical reactions as dissolution / precipitation, redox reactions and cation exchange. I use the version 2.0 so I can consider dispersion and diffusion. The problem is: along the flowpath water is lost through the overlaying confining unit. As I am trying to model freshening of a once saline aquifer I can not match the chlorine concentrations in the downstream part of the system which rise fairly steeply. When I use the transport

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