Stripping analysis of trace metals at a flow-through reticulated vitreous carbon electrode after the preconcentration by supported liquid membrane technique

The performance of a flow-through mercury coated reticulated vitreous carbo n (RVC) electrode in the potentiometric stripping analysis (PSA) of trace m etals has been examined. A wall-jet glassy carbon cell was used for the com parative experiments. Experimental parameters influencing the stripping sig nals have been optimised in order to use the stripping analysis after the p reconcentration and matrix isolation by supported liquid membrane (SLM) tec hnique. The SLM with di-2-ethylhexyl-phosphoric acid (DEHPA) as the extract ant in the membrane liquid for proton driven transport of trace metals acro ss the membrane has been chosen. Results presented for lead determination i n river water demonstrate the analytical advantages of coupled technique SL M-PSA.