Abstract
Some general features of Flow Injection Potentiometric Stripping Analysis are outlined with special regard to the application of the matrix exchange technique. The stripping potentials of cadmium, lead, thallium, and tin in various supporting electrolytes are measured. The data are used to optimize the composition of the carrier solution for the simultaneous determination of mixtures of these elements. Complexing agents as citrate, tartrate, and ammonia lead to a drastic potential shift for bivalent ions, thus permitting the removal of limitations for the simultaneous determination. Among the nearly forty different supporting electrolytes tested, the NH3/KOH stripping solution was found to be unique. The resolution is so good that the four elements Cd, Tl, Pb, and Sn can be determined simultaneously even when they are present in concentrations differing by one order of magnitude.
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