Me. Bottcher, C-13 C-12 PARTITIONING DURING SYNTHESIS OF NA2CA(CO3)2.2H2O, Journal of the Chemical Society, Chemical Communications, (12), 1994, pp. 1485-1485
During the synthesis of Na2Ca(CO3)(2).2H(2)O (pirssonite) from aqueous
solutions at 60 and 90 degrees C, C-13 is enriched in the solid with
respect to the dissolved carbonate species.