Dialysis is neither filtration, nor extraction, nor digestion; the ions, not the larger particles, diffuse across a membrane so that a concentration equilibrium is obtained
The 833IC liquid handling dialysis unit is the sample preparation module for numerous demanding applications.
The determination of anions in complex matrices like milk, fruit juice, soil eluates, suspensions, emulsions, etc, is no longer a problem, says Metrohm.
Dialysis is neither filtration, nor extraction, nor digestion.
In dialysis the ions, not the larger particles (>0.2um ), diffuse across a membrane from the sample into the acceptor solution, so that a concentration equilibrium is obtained.
This has the advantage that neither the sample or the measured values are effected by filter cake.
This also means that matrix effects are largely eliminated.
The dialysis membrane has a working life of up to one week.
Large particles which could block the membrane are simply passed to waste, whereas ions can pass unhindered through the membrane.
Calibration of the dialysis system requires no extra effort.
Recovery and dialysis rates are easy to determine and, with the patented stopped-flow method, are said to be in excess of 98%.
The 833 IC liquid handling dialysis unit can be completely automated and is controlled by the Metrodata IC Net software.
