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Determination of the cation exchange capacity (CEC) and selectivity coefficients KsCd/Ca of a HMWDOM sample (3.5 kDa): (a) The general view of a dialysis tube with a “window” made of a MEMBRA-CEL membrane (3.5 kDa) and an external container; (b) The completed assembly (inside the dialysis tubes there is a suspension of 30 mg of HMWDOM (3.5 kDa) + 10 cm3 of the equilibrating solution).
