Dynamic exchange capacity

During a study of the physicochemical properties of some aminoglycoside antibiotics Kuzyaeval- - determined the static and dynamic exchange capacities of neomycin on the cation exchange resin KB-4P-2(a phenoxyacetic ac. d-f ormaldehyde resin) using the resin in the Na form. 

The product was homo- and copolymerized and investigated in respect to the transition metal sorption properties. The dynamic exchange capacity (DEC) was determined for Cu(II), Ni(II) and Co(II), from nitrate solutions in the presence of NaCl (Table 3). 

Dynamic exchange capacity is determined from output concentration curves at the solutions filtration through adsorbent column, i.e., from the nature of change in adsorbate content in water at the output from the column the working dynamic exchange capacity is determined from the solution volume having flown through the adsorbent column by the moment of the adsorbate appearance at the output ... 

Bovine Serum Albumin (BSA) Theoretical study of dynamic binding capacity under different conditions Anion Exchange disks [93]... 

Fig. 6. Equilibrium (1) and dynamic (2) capacities of the HCO form of the SBF anion exchanger to...

As seen from Fig. 6, an equilibrium capacity of the fibrous anion exchanger is essentially unaffected with increasing gas flow rate and amount to 0.8 mole of S02/eqv. It is usual that in the adsorption processes, the dynamic sorbent capacity in this case decreases. However, at the rate of 6.0 m/min it remains sufficiently high and is 0.4 mole of S02/eqv. 

Anions participate in chemical conversions and in the total exchange dynamics in the soil to an essentially lesser extent than cations. The reason for this is that they are less adsorbed on the colloidal complex, since the soil adsorbents are negative rather than positive on their surfaces. The soil exchange capacity increases with the acidity for anions, which is connected with an increase of the positive charge of soil colloids, particularly of hydrated oxides. In cultivated soils of the Temperate Zone, with a pH... 

In order to determine whether the prepared anion-exchange porous membrane is superior to a gel-bead-packed bed in terms of protein recovery efficiency, an experimental comparison was performed with the same porous membrane and bead-packed bed volumes [12]. BSA in a buffer was permeated across the porous membrane and was made to flow downwards through the bed at a constant operating pressure of up to 0.1 MPa. The effluent was sampled from the outside of the hollow-fiber membrane, and from the bottom end of the bed. The effects of the protein solution flow rate on the dynamic binding capacity of the protein were compared between the membrane and the bed. The dynamic binding capacity is defined as the amount of protein adsorbed until the effluent concentration reaches 10% of the feed concentration. The SV as... 

This investigation resulted in the creation of the database of the equilibrium and kinetic characteristics of the zeolite tuffs using dynamic breakthrough curve. The computer-controlled system was developed in order to obtain experiment breakthrough curves, to carry out their mathematical treatment and to calculate necessary characteristics. The effective equilibrium and kinetic coefficients of some Russian clinoptilolite-containing tuffs from different deposits for the sorption of ammonium-ions were evaluated using this method, the data base was created. The chemical composition, the content of ciinoptilolite in tuffs and total cation-exchange capacity of tuffs have been also included in the data base. 

In the case of reverse phases, it is indicated as %C or in pmol/m, and in the case of ion exchangers in peq/ml or peq/g. In addition to this, there is the dynamic binding capacity, which indicates the capacity for a determined protein for a given flow rate. The dynamic binding capacity depends, of course, on the type and size of the sample molecules, the flow rate and the pore accessibility. 

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