What concentrations of magnesium, sodium and sulfate are needed to precipitate solid MgSO4 and Na2SO4 (let's say evaporation is occurring in a system) I'm assuming probably really high because they are soluble salts? But can someone tell me in mg/L how much?
I'm asking because in this paper I read the authors are claiming magnesium and sodium in solution are coming from dissolution of MgSO4 and Na2SO4 but the concentrations are really low... like 20 mg/L of each. If those minerals were present wouldn't concentrations of Mg and Na be much higher?