Figure A7.

(a) XRD and FT-IR normalized patterns of the recovered EDTA precipitate and AR-grade H₄EDTA. (b) Conservative estimate of the dissolved carbonate degassed from solution (as CO₂) as a function of the initial carbonate concentration during the pH-swing from pH 8–10 to pH 2. No EDTA is present in the system, which removes the (low) dilution effect induced by EDTA titration.