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Ion Exchange Capacity Analysis

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6. Ion exchange capacity Capacity can be used to compare different resins or to calculate the total amount of resin to be added during a batch exchange process [IAEA Vienna, 2002]. It described by the number of functional groups on it. This value is constant for a given ion exchange material and is generally given as milliequivalents per gram (meq/g), based on the dry weight of material in a given form (such as H+ or Cl–). For organic ion exchange resins it can be given as milliequivalents per millilitre (meq/mL), based on the wet fully swollen volume of a settled bed of resin. The total capacity is usually determined by titration, spectrophotometrically and radiometrically for radioactive isotopes. The capacity of the resin in meq/g …show more content…
There are two type of ion exchange capacity: the total static exchange capacity (which is determined under static conditions) and the dynamic exchange capacity (which is determined by passing a solution through a bed of the exchanger). The exchange capacity depends on the number of functional group per gram of the exchanger. The extent of the use of the total exchange capacity depends on the level of ionization of the functional groups of the exchanger, on the chemical and physical conditions of the process, and hydrated ionic radii and selectivity. The operating or breakthrough capacity of a column type ion exchange system depends on its design and operating parameters, the concentration of the ions being removed and the effects of interference from other ions, nature of the functional group on the exchanger, degree of cross-linking, ionic valence, ionic size and temperature. In a column system this generally refers to the volume of the solution that can be treated before a sharp increase in the effluent concentration of the species being removed is …show more content…
C and V are the aqueous phase counter ion concentration and solution volume, respectively; symbols with bars represent the solid phase.
The equation is applied only when the sorbed ion is a microcomponent of the exchange and the solution. Film diffusion control is usually favored by small particle size, low concentration, high capacity and week agitation of solution [Boyd et al., 1947]. Particle diffution: According to Boyd et al [Boyd et al., 1947] if the sorbed ion is a microcomponent of the exchanger, the following particle diffusion equation can be applied for single exchanger of pair of ions. Qt 1 ∞ 1 = F(t) = 1 - ∑ exp(-n2Bt) (18) Q∞ П2 n-1 n2

Where B = П2Di / r2

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