Abstract
Abstract Two methods are presented for the selective preconcentration of As(III) by using complexation-type stationary phases. These phases are prepared: (1) by loading a C18-bonded silica with the cetyltrimethylammonium-pyrrolidinedithiocarbamate (CTA+-PDC−) ion-pair, or (2) by converting a strong anion-exchange (SAX) resin from the quaternary ammonium form into the pyrrolidinedithiocarbamate (PDC−) form. When As(III)-containing solutions are passed through such stationary phases, the immobilized PDC− yields the non-polar As(III)-trispyrrolidinedithiocarbamate (As(PDC)3) which is retained on the non-loaded second part of the C18 cartridge (method 1), or on an unloaded C18 cartridge coupled in series with the SAX cartridge (method 2). For both methods parameters influencing the preconcentration have been investigated by using the 74As(III) radiotracer; 74As(V) was applied to study the selectivity of both methods. A selective preconcentration of As(III) is possible. The retention mechanisms are discussed. ...
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