Difference between RM_GetSpeciesConcentrations and RM_GetConcentrations

[Yongqiang]

Hi PHREEQC experts,

I am using PHREEQCRM to do reactive transport modelling.
I wonder what the difference is between methods of RM_GetSpeciesConcentrations  and RM_GetConcentrations.

Thanks,

[dlparkhurst]

RM_GetConcentrations returns the total concentrations of all elements in each cell, for example H, O, charge, C, Cl, Na, ....

RM_GetSpeciesConcentrations returns the concentrations of every aqueous species in each cell, for example, H+, HCO3-, CO3-2, Cl-, Na+, ...

Check the documentation https://water.usgs.gov/water-resources/software/PHREEQC/documentation/phreeqcrm-html/index.html.