a—[NH3]	total ammonia concentration, compliant with ISO 21877.
AB	ammoniated brine.
AAB	additionally ammoniated brine.
b—[NH4Cl] = [NaHCO3(s)]	chemically bounded ammonia; suspension concentration of precipitated sodium hydrocarbonate; modification of ISO 5314:1981.
C—[Cl−]	chloride concentration, compliant with ISO 5314:1981.
d—[CO2]	total concentration of carbon dioxide in the solution, compliant with Standard Methods 4500-CO2 Carbon Dioxide (2017).
e—[NH2COO−]	carbamates’ ion concentration; NMR and precipitation methods.
F—[CO32−]	carbonates’ ion concentration, compliant with EN ISO 10693:2014.
g—[HCO3−]	hydrocarbonates’ concentration, compliant with EN ISO 10693:2014.
m—[NH3(aq)]	free ammonia concentration, ammonia concentration that is physically dissolved in the solution.
MAB	small additional absorber.
n—[alkalinity]	total concentration of alkaline compounds, compliant with ISO 9963-1.
o—[NH4+]	modification of ISO 5314:1981.
p—[OH−]—[H+]	compliant with ISO 23496:2019.
PC-AB	pre-carbonation ammoniated brine.
R	carbonization ratio of solution.
u—$p_{{(NH}_3)}$	equilibrium pressure of ammonia above the solution.
w—[CO32−] + [HCO3−] + [CO2(aq)]	total concentration of carbonates and free carbon dioxide.
WNa $=z-\frac{[{\mathrm{NH}}_4\mathrm{Cl}]}{\left[{\mathrm{Cl}}^{-}\right]}$	carbonization yield.
Nm	proportionality factor, depending on the temperature.
z = a − n + d + w + p
x′	The values indicated as x’ refer to the non-equilibrium state