Separation and speciation of biodegradable complexes using capillary zone electrophersis

[摘要] ENGLISH ABSTRACT:Separation of the metal ions Cu2+, Pb2+, Cd2+ Mn2+, Cr3+, Fe3+ and Zn2+ with polyethylenediamine tetra-acetic acid (EDTA), ethylenediamine disuccinic acid ([S,S']-EDDS) and ethylenediamine dimalonic acid (EDDM) was performed by CapillaryElectrophoresis.The electropherograms obtained by Capillary Electrophoresis were validated with aspeciation model Joint Expert Speciation System (JESS). Excellent agreement wasobserved for the speciation diagrams for these species with the pH curves determined bycapillary electrophoresis with those determined by speciation modelling using JESS.The ligands EDDS and EDDM are readily biodegradable. They have been proposed assubstitute ligands for EDTA.Detection of the above species was performed using both an electrochemical and a UVdetector. The obtained electropherograms were used for the determination of thedetection limits of these species. The electrochemical detector has a lower detection limitfor these species than the UV detector in conformity with reported literature for thesedetectors.

[发布机构] Stellenbosch University