Calcium is essential for living organisms, particularly in cell physiology, where movement of the calcium ion Ca2+ into and out of the cytoplasm functions as a signal for many cellular processes.

Calcium ion-selective electrode measurements showed that 56 ± 6 mole% of the total added calcium was bound by the polymer, with a Ca 2+ /SO 3− ratio of 0.29 ± 0.03, in agreement with previous ...